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March 30th, 2025

Sunday Gunday: Five “Frankenguns” from our Shooters’ Forum

Exo skeleton frankengun Shelley Davison Tinkertoy 30 BR spare parts

What’s a “Frankengun”? Well it’s a one-of-a-kind rifle that has been pieced together from a variety of different parts and components. It might be a little bit Bolt Gun mixed with a little bit AR-15. Or it might feature some home-made components unlike anything you’ve seen before. The end result is a unique rig you won’t find anywhere else.

We’ve selected these five Frankengun rifles from an older thread in our Shooters’ Forum.

Frankengun #1 — The EXO (as in Exo-Skeleton)

Exo skeleton frankengun Shelley Davison Tinkertoy 30 BR

Forum member jm850 calls this tube-framed wonder the EXO (as in “exo-skeleton”). He says: “This is a prototype I designed around a few core concepts that stick out to me on a traditional configuration. Eliminating stresses, lowering recoil moment, and improved barrel cooling. I’m really happy with it so far.”

The EXO is a very unique rifle. We’ve never seen anything like this since the late Shelley Davidson’s famous Tinkertoy Rifle, a brilliantly innovative 30BR that actually won matches. (Sadly Shelley has passed away). The Tinkertoy, shown below, was truely radical, but it worked ! Could this have been an inspiration for jrm850’s EXO rifle?

Shelley Davison Tinkertoy 30 BR

Frankengun #2 — Mossberg MVG in LSS Stock with BipodeXt

Exo skeleton biponeXt frankengun Shelley Davidson Tinkertoy 30 BR

Forum member BallisticXLR has created something very weird to say the least. It started out as a basic, bone-stock Mossberg MVP Varmint in .223 Rem. Then the transformation began: “I replaced everything except the receiver. It now has an LSS stock, PSG-1 grip from DPMS, XLR butt stock, PT&G lug and barrel nut, Columbia River Arms 26″ barrel with Sonoran coral snake Cerakote, A2 flash hider, Timney and Jard triggers (depending on what I’m doing), and a USO B17 which is now a USO 3.8-22×44.” That long extension tube under the chassis is a BipodeXt from Accuracy Solutions.

Frankengun #3 — A Chassis Rig in 25 Creedmoor

Exo skeleton frankengun Shelley Davidson Tinkertoy 30 BR

This Frankengun belongs to Forum member Geraldgee. This “black and blue” rig features a mag-fed Kelbly Atlas action in a McCree’s Precision G10 Chassis. The barrel is a Bartlein Rem Varmint Contour, 1:7.5″-twist 4 Groove, chambered for the 25 Creedmoor. There are some interesting .25-Cal bullets coming on the market now. You can make the brass by expanding 6mm Creedmoor, or necking down 6.5 Creedmoor.

Frankengun #4 — MDT Chassis, Fore-end Whittled by Spook

Exo skeleton frankengun Shelley Davidson Tinkertoy 30 BR

Here’s a real collection of odds and ends, but Forum member Spook says it shoots well, and is a great example of “Left-over parts made useful again”. This mix-n-match Frankengun features a Remington M7 action with PT&G bolt. The barrel is a stainless Pac-Nor chambered in 6mm SLR. The barreled action is carried in an MDT Chassis with rear folding buttstock. Up front is something unusual, a Delrin fore-end that owner Spook “whittled in the mill”.

Frankengun #5 — 6.5×47 in Accuracy Int’l Stock

6.5x57 Accuracy International Krieger barrel
CLICK photo for full-screen version.

Forum member CT10Ring kicked off the Forum Frankengun thread with this rifle. It’s actually not that shocking, but you rarely see a BAT action in an Accuracy International stock. The BAT VR action is mated to an AI Mag and set up in an AI folding stock. On top is an “old school” Nightforce Benchrest scope. The barrel is a very heavy Krieger chambered for the 6.5×47 Lapua. CT10Ring say the barrel alone weighs about 9 pounds, and the gun “shoots better than [he] can”.

Post Pictures of Your Frankenguns in our Forum
So do you have a favorite Frankengun resting in your gun safe? If you do, visit our Shooters’ Forum and post a description and some photos in the Frankengun thread.

Exo skeleton frankengun Shelley Davison Tinkertoy 30 BR

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March 30th, 2025

Ported Power — S&W Performance Center M&P 10mm M2.0

Smith & Wesson S&W performance center M&P 10mm M2.0 6.6

If you are looking for a modern, extremely powerful semi-auto pistol, you may want to consider the impressive S&W Performance Center M&P 10mm M2.0 pistol. This boasts a long 5.6″ barrel for extra velocity. The barrel is also ported for reduced muzzle flip and less perceived recoil. The gun would be a very powerful defensive pistol and S&W says it can also serve for hunting.

Smith & Wesson states: “The new Performance Center 10mm was conceived with both the hunter and target shooter in mind. The goal was to build upon the M2.0 10mm series, with the intention of having reduced felt recoil and quicker follow-up shots. Popular features previously seen on other 5.6-inch PC pistols are present in this design and, when paired with the flat-shooting 10mm Auto cartridge, provide the end user a total package for hunting, self-defense, or at the range.”

Smith & Wesson S&W performance center M&P 10mm M2.0 6.6

Building off the success of the M&P 10mm M2.0, Smith & Wesson incorporated new features designed to increase the new Performance Center 10mm pistol’s performance. Chambered in 10mm Auto, this full-size polymer handgun boasts a ported 5.6-inch barrel to reduce muzzle rise, optic-height tritium night sights for a clear sight picture in low-light conditions, and a Performance Center-tuned flat M2.0 trigger with a crisp break and audible reset.

Smith & Wesson S&W performance center M&P 10mm M2.0 6.6

The Performance Center 10mm slide is cut for optics and ships with Smith & Wesson’s C.O.R.E. plate system, two 15-round magazines, and four interchangeable palmswell grip inserts. This 10mm pistol is made in the U.S.A. and has an MSRP of $749.00.

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March 30th, 2025

The Making of MatchKings — How Sierra Produces SMK Bullets

Sierra Bullets Carroll Pilant MatchKing Bullet SMK Bullet-making Jacket

The Making of MatchKings — How Sierra Produces SMKs
All Sierra bullets begin life as a strip of gilding metal, an alloy consisting of 95% copper and 5% zinc. To meet Sierra’s strict quality requirements, the gilding metal requires three times more dimensional and quality control standards than is considered standard in the copper manufacturing industry.

A blanking press stamps out a uniform disc and forms the cup that will be drawn into the MatchKing jacket. The cup is then polished and sent to a draw press to be drawn into a jacket that is longer than needed for the future MatchKing, thus allowing for the trim process. Press operators constantly check concentricity to ensures jacket quality. The jackets then go to a trimmer where they are visually inspected again.

Sierra Bullets Carroll Pilant MatchKing Bullet SMK Bullet-making Jacket

After being polished a second time, the jacket travels to the bullet press. In the meantime, 80-pound lead billets are being extruded into lead wire for the cores where great care is taken so that the core wire is not stretched. The core wire is lightly oiled before continuing to the bullet press to be swaged.

The lead core wire and trimmed jacket meet at the bullet press where the first stage forms a boattail on the jacket. The lead core is then formed on top of the bullet press and fed down into the jacket. In one stroke of the press, the MatchKing is formed.

Sierra Bullets Carroll Pilant MatchKing Bullet SMK Bullet-making Jacket

Quality control technicians pull samples from each lot of MatchKings to make sure they meet Sierra’s stringent standards. Samples are then sent to Sierra’s 300-meter underground test range (shown below) to be shot for accuracy on mechanical mounts referred to as “unrestricted return to battery rests” that Sierra designed and built in-house.

Sierra Underground Tunnel test facility Sedalia, Missouri

Sierra bullet sale Clarus Corporation

After inspection, the bullets are placed in the familiar green box along with reloading labels. They are then shrink-wrapped and shipped all over the world.

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