August 15th, 2016

Drop-Port Actions — Stiller’s Slick Innovation

Stiller Drop-Port

Many of you may not have seen how Jerry Stiller’s innovative Drop-Port works with a 6BR, PPC, or Dasher case. Stiller Precision has created one slick system. Just retract the bolt and your case exits, nose-first, through a small port, coming to rest right under the gun. It works by gravity alone so you don’t need a conventional ejector, with the case alignment issues an ejector can create. (An ejector pushes on one side of the rim — this can push the case out of “perfect” alignment.) While Drop-port technology could, potentially, work with nearly any size cartridge, at this time, Drop-ports are only offered for PPC, 6BR, and Dasher-sized cases. Your Editor has a Drop-Port Viper action used with the 6mm BRDX cartridge, which is similar to a Dasher but with a slightly longer neck. It works flawlessly. Our Belgian friend David Bergen was kind enough to video his Viper Drop-Port in action:

Currently, the Drop-port system is available with the Viper action (both aluminum and stainless), and the round-profile Diamondback actions (but expect to wait a LONG time if you want the flat-bottomed Viper action). Because of the nature of Drop-port geometry, this system is optimized for short-length benchrest cartridges such as the 220 Russian, 22 and 6mm PPC, 6mmBR, and the 6mmBR Improved (Dasher, BRX, BRDX). If you plan to use a Drop-port with a Dasher or other improved case, you should tell Stiller Precision when you order. Also, if your gunsmith has not built a Drop-port rifle before, he should first consult with Stiller Precision, (972) 429-5000, to ensure the exit port is placed and inletted correctly in the stock. Getting the geometry exactly right is critical with this system.

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May 11th, 2011

Stolle Panda Drop Port Conversion by S&S Precision Rifles

The Drop Port is a great feature for benchrest shooters. You can run a bolt without an ejector, yet your cartridge will extract smoothly and reliably each time you pull the bolt back. Stiller’s Precision Firearms pioneered the Drop Port design, and Jerry Stiller offers this as a popular option with his Cobra, Viper, Python, D-Back, and Diamondback actions. The Drop Port is amazing in its simplicity (watch video below). As you pull the bolt rearwards, the fired case slides downward into a funnel. As it tilts nose-down, the case rotates free of the six-o’clock extractor, falls nose first down the funnel, and finally exits through a hole in the bottom of the stock. Gravity does all the work.

S&S Panda Drop Port Conversion
Until recently, if you wanted a Drop Port, your only option was to purchase a Stiller action or engineer a conversion yourself. Now the owners of Kelbly Panda actions can enjoy drop-port functionality via a conversion performed by S&S Precision Rifles in Texas. The folks at S&S will mill a slot in the bottom of your action, and then install a drop funnel in your stock. The conversion work is done so well you’d think the Pandas were originally made as Drop Ports by Kelbly. Drop Port conversions will be available for popular small match cartridges including 22 PPC, 6 PPC, 6mmBR, 6BRX, 6 Dasher, 6.5 Grendel, and 30 BR (plus other wildcats in the BR family).

Conversion Will Be Costly — New Actions Are Best Candidates
This conversion will not be cheap. Because Drop Ports require a six o’clock extractor, you’ll probably need a replacement bolt for your Panda. S&S is in discussion with Pacific Tool & Gauge to provide these bolts. You can probably resell your existing bolt, but the upfront conversion cost could approach $400 with new bolt and labor. S&S hopes to announce firm pricing in 4-6 weeks. Don “Stick” Starks, S&S’s lead gunsmith, also cautions that this conversion is most cost-effective with Panda actions that have not yet been installed, or which are set up with pillars (as opposed to glue-ins). Stick explained: “If your Panda is already glued in, then we have to remove the action, mill the port, install the funnel, and then re-bed the whole thing. That’s going to substantially increase your cost. It’s more logical to do this on a Panda that has not yet be put in a rifle.”

In the video above, you can watch S&S Precision convert a Stolle Panda action to a Drop Port, and then see how the converted Panda functions. The rifle is a 30BR owned by FORUM member Truckincars, who also created the video.

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