Larry Medler has devised a smart little invention — a simple, inexpensive Empty Chamber Indicator for rimfire rifles. It is made from a section of plastic “weed-wacker” line and a wooden ball from a hobby shop. Larry says he was inspired by Juniors who used something similar for their 17-Caliber Air Rifles.
How to Make the Empty Chamber Indicator
Construction Method: First, drill a 7/64″ diameter hole all the way through the 1″-diameter wooden ball. Then enlarge half of that 1″-long hole using a 13/64” diameter drill. Next insert an 8″ piece of heavy duty (0.095″ diameter) weed wacker line through the ball, leaving about 2″ on the side with the bigger-diameter hole. Then, with the short end of the line, fold over the last half-inch so the line is doubled-over on itself. Then slide the line into the ball, stuffing the doubled-over section through the 13/64″ (large) hole. Finally, pull the longer end of the line until the doubled-over section is flush with the outside of the ball. This gives you a sturdy line attachment without messy adhesives. When the assembly’s complete, hold the ECI by the tail and dip the ball in yellow paint. If you’re making more than one ECI, you can drill horizontal holes in a spare block of wood and use that as a drying rack.
At a Rimfire Sporter match like this, all shooters must have an Empty Chamber Indicator.
The Empty Chamber Indicator for Smallbore Rifles
Larry explains: “At all Highpower rifle matches, silhouette matches, and other shooting events I have attended, Open Bore Indicators (OBI), or what are now called Empty Chamber Indicators (ECI) have been mandatory. The NRA’s yellow ECI for Highpower rifles is easy to use and has been well-received by the shooters. However, I had not seen a truly workable ECI for 22 rimfire rifles — until I visited Michigan’s Washtenaw Sportsman’s Club where I saw juniors using ECIs for their 17 Caliber Air Rifles. Someone at the club made the empty chamber indicators by attaching an 8″ piece of weed wacker line to a 1″-diameter wooden ball, painted bright yellow. I now make similar ECIs for the 22 rimfire silhouette matches I run.”
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The popular BarrelCool is a compact barrel-cooling device that also serves as an empty-chamber safety flag. A small, battery-powered fan drives cooling air through the barrel’s bore. Yes it really works — manufacturer-provided data shows that BarrelCool significantly reduces the time it takes to cool down a hot barrel. Look at the chart above to see what to expect.
In the past, folks have tried various methods to cool barrels: water flushed through the bore, CO2 tanks, even battery-operated fish pumps. BarrelCool is a simpler, less costly, and much handier solution. Priced at $39.99, this small device can definitely save you time at the range. Potentially it can save you money by extending barrel life. To see how Barrelcool works, watch th videos below that show the BarrelCool units in both bolt-action and AR-type rifles.
BarrelCool Range Reports from Forum Members
Forum members have been impress with the BarrelCool device. Member Comrade Terry said: “At the range, I spend a good bit of time waiting for the barrel to cool between shot strings. I fired my usual 50 rounds today, and (though it was 85° today) I was able to leave the range 30-40 minutes earlier than usual thanks to the BarrelCool. I like it!” Another Forum member, J-Rod, reports “Did some load development on my new rifle. This used to take forever due to the barrel heating up outside in full sun (90° ambient). I’d say this little gem cut about two hours off my normal shooting time. I got home early and the wife was happy — what’s that worth?”
How and Why BarrelCool Was Invented
BarrelCool originated from the idea that cease-fire periods would be a great time to cool a barrel. During cease-fires, most ranges and matches require empty chamber flags in the gun so that the range officer and everyone on the firing line can see visually that the gun is in a safe condition. The BarrelCool does double duty — cooling the barrel while serving as an empty-chamber indicator.
BarrelCool inventor Bryan Sumoba explains: “Previous barrel-cooling methods required additional steps such as running patches down the bore, or a fan that gets in the way of a required empty-chamber flag. BarrelCool now allows the shooter to cool the barrel while having the empty-chamber flag in the firearm.”
Sumoba says BarrelCool significantly shortens the time needed to cool down a hot barrel: “In controlled testing, it took about half the time to cool the barrel from 140 degrees F to 100 degrees F. Our customers also report significant reductions in the time it takes to cool down a hot barrel. At an F-Class match in Sacramento, one shooter fired 25 shots out of his 7mm RSAUM and got the barrel to the point where it was too hot to touch. We placed BarrelCool in his firearm and within 30 minutes, the barrel was back to near-ambient temperature.”
Using three (3) CR123A batteries, a BarrelCool unit can operate for 7-10+ hours. BarrelCool fits both AR-style rifles as well as most bolt action rifles. The Hi-Viz yellow color stands out on the firing line and BarrelCool is small enough to fit in most range or gun bags. Manufactured in the USA, Barrelcool can benefit competition, precision, or recreational shooters who need to cool down their barrels more rapidly, while displaying “safe condition” on the firing line. For more information, or to order for $34.99, visit www.barrelcool.com.
BATTERY TIP: We recommend rechargeable CR123A batteries for use in the BarrelCool. These can last many seasaons and can be charged at home or in a vehicle. Keep a spare set in your range bag. A 4-pack of C123A Lithium Batteries with USB recharger unit is $29.99 on Amazon
DukeDuke says:
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Here’s a new safety device that should prove useful for firearms, particularly pistols. The patented ShotBlock is a hi-viz orange foam chamber plug mated to an orange brush extension that goes in the barrel. This serves the same purpose as a Chamber Flag or Empty Chamber Indicator (ECI), but is more compact (and multi-purpose). With the Shot Block in place a round cannot be chambered. That should, with most firearms, render the gun safe, and unable to fire.*
Currently, the bright orange ShotBlock safety plugs are available for .380 ACP, 9mm Luger, .40 SW, and .223 Remington. Soon versions will be offered for .45 ACP and .308 Winchester as well. Watch the Video to see how this works:
The ShotBlock works by blocking the ability to chamber a round. The ShotBlock is attached to an “extended protection indicator” (i.e. an orange nylon brush). The plug and brush are placed into the barrel with the wide end of the plug on the breech lip. The extended protection indicator (orange brush) can be trimmed to fit the barrel length. Having the tip of brush visible at the end of the gun barrel confirms the Shot Block is in the chamber. As an added benefit, you can spray an anti-corrosion product on the brush for long-term storage.
The inventors state: “Once the ShotBlock is in the barrel of the gun you can easily manipulate the weapon safely, and any attempt to load the firearm will cause the bullet to be wedged inside the Shot Block, and prevent the [cartridge] from going inside the breach.”
Shot Block is Patented
The inventor of the ShotBlock, Bill Masters, has been awarded two U.S. Patents for this product: Nos. 9,448,024 and 9,310,149, both for “Firearm Safety and Chamber Block Indicator”. Bill explains why he invented the ShotBlock: “I had the idea for the ShotBlock after visiting a shooting range with my wife. The owner brought it out of the case and held it facing my wife without clearing it. He finally handed it to me and I cleared it. I left there telling myself there should be an easy way to let the customer know it was safe … to prevent someone quickly loading the weapon and doing bad things with it.”
Bill Masters is an engineer, inventor, designer, entrepreneur, and business advisor. He holds the first 3D printing patent, along with patents for other 3D printing technologies and CAD. He founded Perception Kayaks, which revolutionized the industry through by using molded plastics instead of fiberglass.
Alternative Product Available Soon from Chamber-View
Chamber-View will soon offer a chamber plug for pistols. Like the ShotBlock, Chamber-View’s Universal Empty Chamber Indicator (ECI) prevents a round from chambering. Unlike the ShotBlock, there is no barrel brush, but a large bright orange extension wing serves as an Empty Chamber Indicator:
* We are concerned however, that with some type of floating firing pins in semi-auto systems, it still might be possible to get a primer strike. This might happen if a round is stripped from the magazine and the firing pin moves forward from inertia as the pistol slide or bolt carrier moves forward rapidly and then stops. It’s unlikely a light strike could cause a round to fire, but check your firearm with dummy rounds before assuming it is 100% safe.
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Larry Medler has come up with a smart little invention — a simple, inexpensive Empty Chamber Indicator for rimfire rifles. It is made from a section of plastic “weed-wacker” line and a wooden ball from a hobby shop. Larry says he was inspired by Juniors who used something similar for their 17-Caliber Air Rifles.
At a Rimfire Sporter match like this, all shooters must have an Empty Chamber Indicator.
Construction Method: First, drill a 7/64″ diameter hole all the way through the 1″-diameter wooden ball. Then enlarge half of that 1″-long hole using a 13/64” diameter drill. Next insert an 8″ piece of heavy duty (0.095″ diameter) weed wacker line through the ball, leaving about 2″ on the side with the bigger-diameter hole. Then, with the short end of the line, fold over the last half-inch so the line is doubled-over on itself. Then slide the line into the ball, stuffing the doubled-over section through the 13/64″ (large) hole. Finally, pull the longer end of the line until the doubled-over section is flush with the outside of the ball. This gives you a sturdy line attachment without messy adhesives. When the assembly’s complete, hold the ECI by the tail and dip the ball in yellow paint. If you’re making more than one ECI, you can drill horizontal holes in a spare block of wood and use that as a drying rack.
The Empty Chamber Indicator for Smallbore Rifles
Larry explains: “At all Highpower rifle matches, silhouette matches, and other shooting events I have attended, Open Bore Indicators (OBI), or what are now called Empty Chamber Indicators (ECI) have been mandatory. The NRA’s yellow ECI for Highpower rifles is easy to use and has been well-received by the shooters. However, I had not seen a truly workable ECI for 22 rimfire rifles — until I visited Michigan’s Washtenaw Sportsman’s Club where I saw juniors using ECIs for their 17 Caliber Air Rifles. Someone at the club made the empty chamber indicators by attaching an 8″ piece of weed wacker line to a 1″-diameter wooden ball, painted bright yellow. I now make similar ECIs for the 22 rimfire silhouette matches I run.”
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Christmas is nearly here, so today we’re featuring a hand-picked collection of “stocking stuffers” for precision shooters. Some of these are recent new inventions. All are handy items that you’ll use over and over again at the range, on your vehicle, and/or at your loading bench (so you’re allowed to buy them for yourself, even after Christmas).
Creedmoor Sports ECI, Mag Block, and Dust Cover Flag
The acrylic BT62 Determinator measures groups with laser-cut concentric measuring rings. Check group size quick and easy — simply place the Determinator over shot group. Adjust until one of the circles crosses the center of the two outer-most holes. That gives you the center to center group measurement (1.5″ maximum). Alternatively, you can measure edge to edge (of the farthest shots) and then subtract the bullet diameter. Cool tool for gun guys. The supplied lanyard also glows in the dark.
This handsome red leather ammo holder secures twenty (20) rounds of .308 Win-size ammunition, in a handy plastic carrier. In addition there are loops for 2 more sighter rounds on the outside. This is a very nice gift for a target shooter or hunter. There is also a .223 Rem version in black leather. Both these leather ammo holders conveniently fit into a shooting coat pocket via a leather pocket flap.
Always watch the wind when you shoot. Inexpensive, Day-Glo Surveyors’ Tape (aka “Flagging Tape”), attached to a stake or target frame, makes a good wind indicator. It will flutter even in mild breezes, alerting you to both angle and velocity shifts. This should be part of every range kit. Don’t leave home without it. This can also be ordered from Creedmoor Sports for $3.99 per roll.
You won’t find a more versatile tool at this amazingly low price — just $5.99! The Cabela’s multi-tool performs many functions. It features flat-nose pliers, wire-stripper, knife, Phillips and flat-head screwdrivers, saw, bottle opener, and scissors. Nylon sheath included. This handy tool is available in size colors: Red, Green, Orange, Purple, Teal, and Silver. A nylon sheath is included.
Here’s a very clever use of fired pistol brass. A female-threaded insert in the brass cases matches the threads on your automotive valve stems. So these Brass Stem Caps fit right in place. Way cooler than plastic stem caps — these definitely send a subtle but meaningful message. The $9.95 set comes with four (4) .40 SW caliber, once-fired valve stem caps.
Bullet Central — Magnifying Light, $12.95 – $19.50
If you’re like most shooters, you can use more light and magnification when inspecting brass and small gun parts. Here is the perfect tool to help and it doesn’t take up a ton of space. With the Bullet Central Magnifying Light you can ease your eyes and see into the primer pockets, flash holes or case-necks without straining. With your choice of battery-powered or rechargeable models, why not buy two and give one to your favorite range buddy?
This Outers-brand, 51-piece set contains all the drivers you could ever need: Flat-head, Phillips, Hex (Allen), and Torx. Priced under ten bucks, this driver set offers great value for the money. Even if you already own high-quality Allen and Torx wrenches, you can buy this as a spare set for your gun room. And this also makes a great holiday “stocking stuffer” for gun guys. These drivers work great for installing scope rings or bases, or everyday use around the home.
• Molded Driver with Magnetic Tip
• 15 Flat Head Bits
• 10 Hex Bits (inch)
• 9 Hex Bits (metric)
• 4 Phillips Bits
• 9 Torx Bits
• 2 Extra Long Phillips Bits
• 1 Hex to Square Adapter
How many times have you gone to look into a barrel or dark corner of a gun only to find you just can’t see in there? You can easily solve this problem by picking up this Compact Bore light for just $7.92 on Amazon. A bore-light is a “must-have” item for handgun owners, and these are also handy for inspecting dies, rifle chambers, and tool interiors. Honestly for this price you should grab a couple so you have one in your range bag and another on your bench.
BONUS — TACTICAL STOCKINGS for Your Stocking Stuffers
Don’t have a stocking to hold your small gift items? Well we’ve got you covered — check out these cool, heavy-duty stockings. These Garud Tactical Stockings come in four colors: Camo, OD Green, Black, and Khaki. They all feature 4 MOLLE attachments, rugged carry handle, hanging hook, swivel carabiners, outside draw pocket, and even Velcro USA Flag Patch. Get all this for the low price of $12.99 (black) or $13.99 (other colors). These stockings are sure to bring smiles to your tacticool family members and friends. And right now they ship for FREE on Amazon.
Credit EdLongrange for BT62 Determinator suggestion.
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The BarrelCool is an innovative, compact barrel-cooling device that also serves as an empty-chamber safety flag. A small, battery-powered fan drives cooling air through the barrel’s bore. Yes it really works — manufacturer-provided data shows that BarrelCool significantly reduces the time it takes to cool down a hot barrel. Look at the chart above to see what to expect.
In the past, folks have tried various methods to cool barrels: water flushed through the bore, CO2 tanks, even battery-operated fish pumps. BarrelCool is a simpler, less costly, and much handier solution. Priced at $34.99, this small device can definitely save you time at the range. Potentially it can save you money by extending barrel life. To see how Barrelcool works, visit BarrelCool.com. There you’ll find video demos of BarrelCool units in both bolt-action and AR-type rifles.
BarrelCool Range Reports from Forum Members
“Early adopters” of BarrelCool have been impressed so far. Forum member Comrade Terry said: “At the range, I spend a good bit of time waiting for the barrel to cool between shot strings. I fired my usual 50 rounds today, and (though it was 85° today) I was able to leave the range 30-40 minutes earlier than usual thanks to the BarrelCool. I like it!” Another Forum member, J-Rod, reports “Did some load development on my new rifle Friday. This used to take forever due to the barrel heating up outside in full sun (90° ambient). I’d say this little gem cut about two hours off my normal shooting time. I got home early and the wife was happy — what’s that worth?”
How and Why BarrelCool Was Invented
BarrelCool originated from the idea that cease-fire periods would be a great time to cool a barrel. During cease-fires, most ranges and matches require empty chamber flags in the gun so that the range officer and everyone on the firing line can see visually that the gun is in a safe condition.
BarrelCool inventor Bryan Sumoba explains the advantage of Barrelcool: “The challenge with the previous barrel-cooling methods is one would have to be present to run the device, it required additional steps such as running patches down the bore, or it gets in the way of a required empty-chamber flag. BarrelCool now allows the shooter to cool the barrel down simply and easily while having the empty-chamber flag in the firearm.”
Sumoba says BarrelCool significantly shortens the time needed to cool down a hot barrel: “In controlled testing, it took about half the time to cool the barrel from 140 degrees F to 100 degrees F (more in some cases depending on the barrel contour/length and ambient temperatures). Our customers also report significant reductions in the time it takes to cool down a hot barrel. At a recent 3×1000 F-Class match in Sacramento, one shooter fired 25 shots out of his 7mm RSAUM and got the barrel to the point where it was too hot to touch. In most cases, the barrel would still be very warm/hot by the time the next relay started. We placed BarrelCool in his firearm and within 30 minutes, the barrel was back to near-ambient temperature. Other observers mentioned that the air coming out of the muzzle with BarrelCool in the firearm felt like a mini blow dryer.”
Using three (3) CR123A batteries, a BarrelCool unit can operate for 7-10+ hours. BarrelCool fits both AR-style rifles as well as most bolt action rifles. The Hi-Viz yellow color stands out on the firing line and BarrelCool is small enough to fit in most range or gun bags. Manufactured in the USA, Barrelcool can benefit competition, precision, or recreational shooters who need to cool down their barrels more rapidly, while displaying “safe condition” on the firing line. For more information, or to order for $34.99, visit www.barrelcool.com.
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