Completed my G1; need headspace advise.

MonV · March 23, 2002, 16:20

I finally completed my G1 bought from FAC on an Imbel R1A1 receiver from Wholesale Guns & Ammo. I just finished headspacing it and now I need your help. Largest pin gauge that will close on GO is .264. What size locking shoulder should I use if I want it to take most any surplus ammo? By the way, I have no digital camera so I can't post pictures. I used Tapco plastick butt stock, pistol grip and hand guards. For now the rifle has not been refinished but cold blued with Oxpho Blue. It looks nice as it is. I also have Tapco's AK 74 type muzzle device and their aluminum Cocking Handle and ST gas piston. Also installed FSE hammer, trigger and sear. Now I just need the correct locking shoulder and I'm ready to give it a range test. Thanks for looking.

Deltaten · March 23, 2002, 17:27

MonV:
You didn't say which go gauge you used, so I'll assume a 1.630" .

As I understand, and install it, 7.62 in a FAL should end up around 1,632-1.635, to get it to work w/most all mil-surp ammo. If yours is just closing on a .264, go w/a .263 for a "final" (w/some setback from break-in), to end up at 1.632 +/-. Mine run well at 1.632-1.635.
A 1.640 (.308 no-go) is actually a reasonable "max" for a working FAL. Anything past that is getting a little hairy and should be checked regularly and re-HS'd soon.

YMMV, mebbe some other RKI'can comment.

Best,
Paul

HD99FXR3 · March 23, 2002, 21:44

deltaten, don't you mean 1.634 as no-go for .308? 1.640 is IIRC field reject for 7.62x51 NATO

monv if your go gage is 1.630 then your LS sizes should be .263= 1.631 + .001 for set back would give you 1.632 for a headspace, a.262 would give HS of 1.633 using above as reference point. a .261 = 1.634 HS using above as reference. measure your LS that came with kit if it measures .261-.263 i personally would use what came with the kit. you should shoot for 1.632-1.634 as a HS. HTH

Deltaten · March 24, 2002, 05:54

HD:

Yup!! You are right. I mis-typed the #s. It WAS late, and I just got back from the gunshow. Thanks.

MonV....see, I told you someone would come to my rescue!

Best,
Paul

March 23, 2002, 16:20	#1
MonV Registered FALaholic #: 5524 Join Date: Feb 2002 Location: Long Island, New York Posts: 204	Completed my G1; need headspace advise. I finally completed my G1 bought from FAC on an Imbel R1A1 receiver from Wholesale Guns & Ammo. I just finished headspacing it and now I need your help. Largest pin gauge that will close on GO is .264. What size locking shoulder should I use if I want it to take most any surplus ammo? By the way, I have no digital camera so I can't post pictures. I used Tapco plastick butt stock, pistol grip and hand guards. For now the rifle has not been refinished but cold blued with Oxpho Blue. It looks nice as it is. I also have Tapco's AK 74 type muzzle device and their aluminum Cocking Handle and ST gas piston. Also installed FSE hammer, trigger and sear. Now I just need the correct locking shoulder and I'm ready to give it a range test. Thanks for looking.

March 23, 2002, 17:27	#2
Deltaten Registered FALaholic #: 124 Join Date: Jul 2000 Location: Lancaster, PA USA Posts: 8,500	MonV: You didn't say which go gauge you used, so I'll assume a 1.630" . As I understand, and install it, 7.62 in a FAL should end up around 1,632-1.635, to get it to work w/most all mil-surp ammo. If yours is just closing on a .264, go w/a .263 for a "final" (w/some setback from break-in), to end up at 1.632 +/-. Mine run well at 1.632-1.635. A 1.640 (.308 no-go) is actually a reasonable "max" for a working FAL. Anything past that is getting a little hairy and should be checked regularly and re-HS'd soon. YMMV, mebbe some other RKI'can comment. Best, Paul __________________ All or Nothing! Senator McCarthy was right! and as always......FYB!

March 24, 2002, 05:54	#4
Deltaten Registered FALaholic #: 124 Join Date: Jul 2000 Location: Lancaster, PA USA Posts: 8,500	HD: Yup!! You are right. I mis-typed the #s. It WAS late, and I just got back from the gunshow. Thanks. MonV....see, I told you someone would come to my rescue! Best, Paul __________________ All or Nothing! Senator McCarthy was right! and as always......FYB!

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March 23, 2002, 21:44	#3
HD99FXR3 Registered FALaholic #: 5260 Join Date: Jan 2002 Posts: 1,245	deltaten, don't you mean 1.634 as no-go for .308? 1.640 is IIRC field reject for 7.62x51 NATO monv if your go gage is 1.630 then your LS sizes should be .263= 1.631 + .001 for set back would give you 1.632 for a headspace, a.262 would give HS of 1.633 using above as reference point. a .261 = 1.634 HS using above as reference. measure your LS that came with kit if it measures .261-.263 i personally would use what came with the kit. you should shoot for 1.632-1.634 as a HS. HTH