tomv

I built a 2011 lower with a Nelson custom that exactly matched my Steelcat SC Open guns. Even added 6 oz to the plastic 2011 .22 mags to match loaded 10 round 9mm mags. Same grip same sight etc... Actually couldn't tell if I was drawing and sighting the 9mm or 22 until it went boom. Very effective practice indoors during our long CT winter.

I would guess you are asking for trouble if you remove the weight and shoot full power ( 130 PF ) ammo. I'm sure that Ruger designed the system considering Newtons second and third law. So while the momentum (force) generated by 130PF ammo is within original design limits, if the mass of the bolt is reduced the bolt will be accelerated to a higher velocity. Not sure what the result of this would be in practice, but probably not good. However, if the load is reduced to 110 PF, such as those used for Steel Challenge, then I'd guess that a reduction in the mass would be OK since the force acting on the bolt is lower. Would have to do some math to calculate how much is possible. In fact, reducing bolt mass might actually be necessary to get the gun to cycle reliably.

Here are my two Steel challenge guns. One is a 9mm, the other is a .22. Externally identical except for grip (another 15D grip on order) and 9mm mag adapter. .22 weighs 4# 8 oz, 9mm weighs 5# 6oz.

115 MG JHP over 3.8 gr N320 @1.135.

I found some 3/4"ID - 7/8" OD O rings at the hardware store. Seem to be a perfect match for the two good ones that are left. We'll see what happens.

When I pulled the SCS buffer out of my PCC to install a Battle Arms stock on it, I noticed that the frist two O rings (four weight system) were broken and flattened. Anyone Know what causes this? I want to shoot the gun this weekend so I can't wait for JP customer service for replacement O rings. They look like standard 3/4" rings so I'll try those. Is there anything special about the JP ones?

The problem is the sharp edges at the points where the diameter changes. Mine was broken in 3 pieces. JP replced it with one that has nice radii t those points. Just inspected my second JP 9mm bolt. same proble4m. Will contact theem for a second replacement.

Power factor is not an issue for Steel Challenge. The lighter the better.

is that a Blackhawk Axiom stock?

Frequently Hiperfire problems are the result of some kind of debris in the mechanism, brass shavings etc. I always blow my trigger group out with compressed air when cleaning the gun.

I reverse engineered the Atlanta Arms 100 gr Steel Challenge load. They use the Berry's hollow base plated bullet and I measured about 4 gr of N310 powder. I never used those bullets but developed a load based on 95 gr Montana Gold JHP bullets over 4.0 gr of N310 at 1.085 COAL. These are pretty close to the Atlanta loads, about 110 PF. However, they are too short to cycle reliably in my PCC but are fine in my Steelcat pistol. You could try the Berry's bullet which can be seated longer, say 1.135". Those should run fine

Is ejection port on left side of this gun?

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Another vote for the Limcat. Very rigid and a good blast shield. Youb can also get finer adjustment of thumb rest position with the Limcat mount.

The 2 minute dot on the 510 C is more than sufficient when used with the 67 MOA circle. Best feature of the sight in my opinion.

I'm using CCI SV and Mini Mags in my 4.5" barrel. Lots of fliers with CCI pink bullets and Patriot pack.

+1 for Mobil 1. great in cold weather

I agree that a comp is effective on a pistol. To settle an argument on this subject, I wrapped the comp on my 22 conversion with about 5 layers of aluminum foil and then shot it. The aluminum was disintegrated by the force of the gas exiting the comp. Can also see the difference shooting this gun wit / without comp.

It doesn't seem that a .22 LR will generate enough gas to produce a significant reaction at the barrel ports. Not that one is needed for .22 anyway. I agree that the ports make it easier for the timer to pick up shots.

I'm confused. I thought that the Wiland barrels were shrouded. How can a compensator work in that setup?

Do both of these have the same barrel except for the finish?

I'm running the Taccom ULW with JP bolt and SCS buffer, Buffer has 2 steel weights and 1 Tungsten to facilitate shooting light loads. MG 115 JHP, 3.8gr N320, 1.135"

Looks like a space gun! What barrel are you using?

So about 2.6 oz less than my Volquartsen Ultralight with no threads. Very nice. How about a picture from one of you guys?

Here's the link to the grip on Optics Planet: https://www.opticsplanet.com/hog-13100-ar15-15d-vertical-grip-blk.html