View Full Version : locking shoulder size survey for G1 kit builders

Stg 58
September 22, 2001, 18:40
What size LS was used.I built mine on a DSA reicever and it used a .261.Just helped a freind do one on a Imbel and it needed a .264.Are the G1 chambers cut a little longer?Thanks :) :)

September 22, 2001, 20:38
I have a G1 that I put on a DSA type 1 receiver. I used a .254 locking shoulder. The only issue I had was the gas system. I think the Tapco piston I put in it is no good. It fails to eject the brass with the gas full blast about 50% of the time. Other than that its a tack driver.

September 22, 2001, 22:33
I just built one on an Entreprise, and it used a .262 to get a 1.632 headspace guage to go.

The first bolt (which was NFG) I used from a donor StG kit needed a .264 for the same 1.632.

September 23, 2001, 06:38
Hey Stg 58,
I put together 2 of the G1's on DPMS receivers, these both required larger than normal LS (both .271), my STG kit required approx that size also. I believe Gunplumber says most in spec receivers/barrels will use a .261-.262. My collection of LS have a lot of this size, but many of my builds seem to have been slightly over/under as I experiment with other receivers. My DSA receiever did use (I think) a .262 with a .060 L1 breeching washer to time correctly. My Entreprise receivers also seem to average about .262 on most builds.

September 23, 2001, 11:47
Mine went together with a .264 in a DSA type 1. :)

September 23, 2001, 12:48
Mine was a .265 in a DSA type 2


September 23, 2001, 13:56
Well just wanted to update you guys on my fal build of the G-1 on the Hesse receiver. After solving headspace issues and a list of out of spec cut on the receiver. It used a .269 locking shoulder, I can live with that. It's been a long road on a Hesse. Never again!!!!! :) :D ;)

September 23, 2001, 14:29
I built one on a Wiliams aluminum and it headspaced perfectly with a .261 LS.

L1A1 I had to use a .270, but it gages good.

Take Care All.

Stg 58
September 23, 2001, 15:12
IIRC gunplumber states that the normal range is .257-.261. it no big deal needing the bigger size LS but i think few of us have a LS that size laying around. I think most have the in the "normal range".

September 29, 2001, 11:32
My Entreprise Type 3 took a .254 I was really happy that it was in spec.

September 29, 2001, 22:16
0.264 with either of my two bolts on a non gear-logo'd Imbel

September 30, 2001, 02:10
.261 on Williams Arms Receiver.