View Full Version : Argentine bbl and DSA receiver - super short locking shoulder

January 20, 2009, 18:15
My friend and i just started building two DSA receivers with Argentine barrels. They required a 0.252 and 0.250 locking shoulder respectively..

Is that due to the Argentine barrel or the DSA receiver?

any drawbacks with such a 'deep' barrel / breach relationship?

Ron Walker
January 20, 2009, 21:13
One Argie barrel I worked on had an extremely long breech. Would a breeching washer bring it closer to a normal size? Ron

January 20, 2009, 23:45
Originally posted by Ron Walker
One Argie barrel I worked on had an extremely long breech. Would a breeching washer bring it closer to a normal size? Ron

I don't think it will work. To time it twistedneck would have to back off one complete turn and if I'm thinking correctly and doing the math right that would be:

1 turn = 1"/16 = .0625"

.250 + .0625 = .3125" which would be too large.
Hope I'm wrong. :sad:

I think the newer DSAs are running short. The one I have left to go, looks like its going to need a .253 or .254.

Edited cause I can't type for $hit.

January 21, 2009, 12:26
All of my DSAs lately have needed .250 to .254 locking shoulders lately. The newer receivers w/new or newer barrels seem to be running short.

January 21, 2009, 13:49
The last couple of Denton builds have seen the same thing.

January 21, 2009, 18:33
My 3 recent new DSA receivers mated with 2 Imbels were .252, 254, and the STG was .256 locking L/S's. Talking with Gunpartsguy and Gunthings, they have been selling those sizes I mentioned and .250 with high frequency lately.

fal fiend
January 21, 2009, 21:16
i once barreled a dsa type 2, with 3 differnt barrels , 3 differnt bolt & bolt carriers, everytime. .250.

January 24, 2009, 05:43
Thanks everyone.. i'll give you guys a range report for sure.

Anything i should know about that Argentine barrel? it looks like a standard type.. but i'm not a fal person. it also looks chrome lined. but, are they button rifled? hammer forged?

thanks again. JEff

January 29, 2009, 23:43
Don't shorten an Argentine barrel because often with Argentine barrels the the bore is not concentric with the outside of the barrel
See http://www.falfiles.com/forums/showthread.php?s=&threadid=153239&highlight=Arg%2A

If you use the regular taller Argentine front sight block it will need the tall Isreali front and rear sights.

Eric Bryant
January 31, 2009, 22:47
Data point #1: A recent DSA receiver with a DSA med. contour barrel - 0.262"

Data point #2: A recent DSA receiver of similar vintage (but not the same as the above) with a Imbel barrel - 0.250"

I doubt this has any meaning, so take it for what it's worth.