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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 1st, 2020

Sunday GunDay: Radical Skeleton-Stock Rifles from Texas


A few seasons back, our Editor and his friend Joe Friedrich flew to Texas to visit Gene Beggs and test rifles in Gene’s 100-yard indoor tunnel. That was a once-in-a-lifetime opportunity to shoot centerfire rifles in such a test facility. Here’s our report…

The South Texas Tunnel

Gene Beggs operates his own 100-yard indoor tunnel and rifle testing facility just outside of Odessa, Texas. Surrounded by tall fencing, this place really looks like a “Area 51″ secret military facility.

In his South Texas tunnel, Gene provides instruction and “tunnel time” for serious benchresters looking to improve their skills and optimize the accuracy of their rifles. Along with teaching the fine points of short-range benchrest, Gene employed his tunnel to develop a pair of radical rifles, one chambered in 220 Beggs, a slightly modified 220 Russian, and a second chambered in 6mm Beggs, a necked-up version of the 220 Russian that retains the original body taper and shoulder angle.


Radical Skeleton Stocks with Aluminum Sled mounted to Barrel
Both rifles shared a skeleton design which uses the Stiller Cobra or Viper action as a central load-bearing member. Remarkably, there is no conventional fore-arm at all. Gene has bolted, directly to the barrel, a 3″-wide bag-riding aluminum sled. The sled was not designed as a mid-barrel tuner, but it might have some beneficial effects in that regard. However, the tuning functions are handled by two concentric rings threaded to the muzzle. Gene believes that with minor rotations of his front tuning rings, he can dial the gun into tune and the tune can be easily adjusted as conditions warrant.

Do Mr. Beggs’ guns shoot? Absolutely. We had the chance to visit Gene in Odessa. We shot both the 220 Beggs-chambered rifle, and its 6mm Beggs-chambered cousin. Both rifles are nearly identical, though the Heavy Varmint-weight 220 has a longer, 27″ barrel compared to 22″ for the Light Varmint 6mm.

In the tunnel, the 220 HV, with a no-turn-neck 220 Beggs chamber, produced three-shot groups in the low ones and zeros right out of the gate, even before the tuner was optimized. With a barrel with over 1000 rounds through it, after firing 40 rounds without cleaning, Gene produced a tiny 5-shot group in the low ones. The first shot was slightly high (a common occurrence in the tunnel according to Beggs). The last 4 shots, rounds 42-45 since the barrel had been cleaned, went into 0.084″. This rig, though radical in the extreme, certainly appears fully competitive with more conventional BR rigs, and it tracked superbly, with no hopping or rocking on the bags.

220 Beggs — Simple, Accurate, Efficient

We were also very impressed with the 220 Beggs cartridge. It’s basically a plain 220 Russian with a sharper radius at the neck-shoulder junction. Gene has commissioned a 220 Beggs reamer with matching seating and full-length sizing dies. The little cartridge achieves 3600+ fps with a 52gr bullet, pushed by Benchmark powder.

Less Recoil Than 6PPC — From what we could tell during our short visit, the 220 Beggs is easy to load for, and performs exceptionally well with either turned (.250″) or no-turn necks. The recoil was noticeably less than a 6mm PPC, making the gun a joy to shoot. This round, we felt, could also be an outstanding varmint cartridge. The velocity is there, and we don’t think any other 22-caliber varmint cartridge is going to beat it for inherent accuracy.

As for the 6mm version, Gene told us: “The 6mm version of the cartridge performs best with Hodgdon’s H4198 Extreme, but the 220 has proven it will shoot well with just about anything you put in it including N133, H322, Benchmark, 8208, Norma 200 etc. It is the most trouble-free, user friendly cartridge I have ever worked with and will compete heads-up with anything. It’s also very easy on the shoulder.”

Gene Beggs sells components (reamers, dies etc.) for the 220 and 6mm Beggs, and also, under special circumstances, offers training/testing sessions in his West Texas Tunnel on an appointment basis.

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