Finished 2 builds today....1911 2011 RACEGUN PORN

[MuayThaiJJ]

Springfield 1911 Loaded Target (7# var RS, 15# MS) (with Lightening Cuts, fiber optic front sight, stock 5" barrel, 6" barrel w/ fixed EGW 7-port titanium compensator, steel magwell, Valkyrie Dynamics skeleton grips, Wilson checkered front strap, Eemann Tech thumb rest slide stop, Sprinco Recoil System, and Sagisi Customs cerakote)

 

Rock Island M1911-A2 2011 (8# var RS, 15# MS) (w/ Wilson Combat Extended safety, AlumaGrips, Fusion tool-less guide rod, Fusion mag release, Dawson extended firing pin, Aftec extractor, STI long-curved polymer trigger, STI sear, KKM Match Grade Barrel, Bedell Compensator, Limcat Custom Slide Racker, Limcat Custom Optic Mount, C-More RTS 2 6 MOA Optic, slide lightening, fitting, finish and machining was done by Limcat Custom Guns.)

Edited November 29, 2020 by MuayThaiJJ

[Rnlinebacker]

Nice 1911s. Especially the double stack 

[Byron Simpson]

Looking sharp!  Great work.

[MuayThaiJJ]

thanks guys, working on getting these cycling 100%. Getting stove pipes

[Bakerjd]

Interesting that Limcat worked over a RIA.... 

[zzt]

12 hours ago, MuayThaiJJ said:

thanks guys, working on getting these cycling 100%. Getting stove pipes

 

Common with tight new guns.  That's why I leave mine in the white until I've shot them in.  On both guns you can increase the radius on the FPS so that it comes all the way up to the firing pin hole.  On the Open gun you can go to a conventional 7 lb. recoil spring.  You can up the PF on both loads.  Another thing you can do is burnish the rails and ways.  Take the recoil spring and rod out, clean all the ways and rails, lube with a good oil or motor oil, the run the slide back and forth over the full travel a couple hundred times.  Repeat if necessary.

[MuayThaiJJ]

2 hours ago, zzt said:

 

Common with tight new guns.  That's why I leave mine in the white until I've shot them in.  On both guns you can increase the radius on the FPS so that it comes all the way up to the firing pin hole.  On the Open gun you can go to a conventional 7 lb. recoil spring.  You can up the PF on both loads.  Another thing you can do is burnish the rails and ways.  Take the recoil spring and rod out, clean all the ways and rails, lube with a good oil or motor oil, the run the slide back and forth over the full travel a couple hundred times.  Repeat if necessary.

 

Thanks, I've had luck with var RS, any reason why I should use a conventional?

[zzt]

52 minutes ago, MuayThaiJJ said:

 

Thanks, I've had luck with var RS, any reason why I should use a conventional?

 

a 7 lb. variable sometimes has trouble stripping a round.  A 6 lb. variable will not strip a round in any of my Open guns.

 

On my first Open build I built it tight, just like I would with a bullseye gun.  With a 7 lb. recoil spring, 17 lb. mainspring and a high radius FPS, 172 PF ammo would literally dribble out of the gun.  So I burnished and shot it in rather than lapping.   As shooting progressed the case ejected farther and farther.  After about 6000 I decide it was time to tune the gun and load for best performance.  A 169 PF load with 'normal' Open gun radius on the FPS, an 8 lb. recoil spring and a 19 lb. mainspring gave the best results.  A 9 lb. recoil spring was a very close second.  Brass ejects 3-4' with this setup.

 

I did the same with my 1911 Open gun for Steel Challenge.  It is still a little too tight, so I have to use 145 PF loads to get it to cycle.  I'm deciding whether to lap this one, because I don't shoot anywhere near the number of rounds for SCSA as I do for USPSA.

[MuayThaiJJ]

31 minutes ago, zzt said:

 

a 7 lb. variable sometimes has trouble stripping a round.  A 6 lb. variable will not strip a round in any of my Open guns.

 

On my first Open build I built it tight, just like I would with a bullseye gun.  With a 7 lb. recoil spring, 17 lb. mainspring and a high radius FPS, 172 PF ammo would literally dribble out of the gun.  So I burnished and shot it in rather than lapping.   As shooting progressed the case ejected farther and farther.  After about 6000 I decide it was time to tune the gun and load for best performance.  A 169 PF load with 'normal' Open gun radius on the FPS, an 8 lb. recoil spring and a 19 lb. mainspring gave the best results.  A 9 lb. recoil spring was a very close second.  Brass ejects 3-4' with this setup.

 

I did the same with my 1911 Open gun for Steel Challenge.  It is still a little too tight, so I have to use 145 PF loads to get it to cycle.  I'm deciding whether to lap this one, because I don't shoot anywhere near the number of rounds for SCSA as I do for USPSA.

 

That's such good info, on my Springer I have a 15# MS and with a 8# var RS is was cycling. I am changing the guide rod to a Sprinco recoil system and think I might need to go lighter on the RS - maybe 7# or 6#.

 

On the RIA I believe it has a 17# MS, and I plan on changing it to 15#, and I've tried 9#, 8#, and will try 7# next.

 

I am shooting factory 115gr or 124gr, I don't load so I need to find a sweet spot to tune these guys so they will eat factory ammo.

I tried aluminum and polymer buffs and had failures galore! So I ditched them.

I also tried shooting reloads yesterday and had 2 jams! The whole range was waiting on me to disassemble the Springer, the barrel would not move. I had to take a rubber hammer and whack is loose. Embarrassing, and now afraid to shoot reloads in the Springer again...the RIA ate some with FTE.

 

If these var springs still give me issues I will try conventional again.

Edited November 30, 2020 by MuayThaiJJ

[zzt]

3 hours ago, MuayThaiJJ said:

I am shooting factory 115gr or 124gr, I don't load so I need to find a sweet spot to tune these guys so they will eat factory ammo.

 

I think you are going to have a hard time with that.  Factory loads do not make anywhere near enough gas.  You are redirecting most of it up through the comp ports, so there is little to jet forward to send the slide back.  If I try to run factory through my Open guns the round fires and the slide goes back a tad, but not far enough to eject the case.  The slide comes forward and rechambers the empty case.  Yours are better than that, but you get stovepipes instead.

[caspian guy]

Maybe see if you can source a box of 9mm nato and see if that gives enough PF to make it cycle.

[MuayThaiJJ]

Thanks guys, I'm gonna give the 7# and maybe 6# var RS a shot with the reduced 15# MS, since I have a ton of factory 115. I'll ask some of my reloading buddies to load me some special 9mm that will cycle, any suggestions for a minimum load?

[zzt]

7 minutes ago, MuayThaiJJ said:

I'll ask some of my reloading buddies to load me some special 9mm that will cycle, any suggestions for a minimum load?

 

I'd be really careful about that.  You are, or will be so lightly sprung that any real Open load (even minor) will batter the gun.

 

Here is how I would approach it.  After cleaning and burnishing the rails and ways as I outlined above, clean the gun again and go shoot your hottest 115 ammo.  Did it cycle?  If yes, can you get a whole mag off without a hitch?  If not, grip the gun tighter and try a couple of rounds again.  Try the same with the 124s.

 

If you get any of that to work you are good to go.  If you can't get the reliability you want, talk to your buddies.

 

My minor load, designed for a comp'd Open gun is 7.0 gr 3N39 under a 124 JHP or plated.  It makes 145 PF.  I'm running that with an 11 oz. (total weight) slide, a highly radiused FPS, 17 lb. recoil spring and a 17 lb. mainspring.  If your slide(s) are lighter than that, up your recoil spring weigh by 1 or 2 lbs. to start, then go back down if needed.

 

I want the comp to work, so that's why I'm using the slow powder.  I can get the gun to cycle 124s loaded with Sport Pistol, but the comp is not worked.  I'll also note you may have troubled talking your buddies into doing this for you unless you can supply them with the necessary primers.

[MuayThaiJJ]

thanks bro, will do

[ParaGunner]

Ditch the sprinco recoil system and it will run better.

[RangerTrace]

On 11/30/2020 at 5:40 PM, zzt said:

 

I'd be really careful about that.  You are, or will be so lightly sprung that any real Open load (even minor) will batter the gun.

 

Here is how I would approach it.  After cleaning and burnishing the rails and ways as I outlined above, clean the gun again and go shoot your hottest 115 ammo.  Did it cycle?  If yes, can you get a whole mag off without a hitch?  If not, grip the gun tighter and try a couple of rounds again.  Try the same with the 124s.

 

If you get any of that to work you are good to go.  If you can't get the reliability you want, talk to your buddies.

 

My minor load, designed for a comp'd Open gun is 7.0 gr 3N39 under a 124 JHP or plated.  It makes 145 PF.  I'm running that with an 11 oz. (total weight) slide, a highly radiused FPS, 17 lb. recoil spring and a 17 lb. mainspring.  If your slide(s) are lighter than that, up your recoil spring weigh by 1 or 2 lbs. to start, then go back down if needed.

 

I want the comp to work, so that's why I'm using the slow powder.  I can get the gun to cycle 124s loaded with Sport Pistol, but the comp is not worked.  I'll also note you may have troubled talking your buddies into doing this for you unless you can supply them with the necessary primers.

Dang that is a HEAVY recoil spring for an open gun!! or did you mean 7?

[zzt]

58 minutes ago, RangerTrace said:

Dang that is a HEAVY recoil spring for an open gun!! or did you mean 7?

 

Oops.  Yes, I meant 7.  Thanks.  

Edited December 16, 2020 by zzt