Argentine bbl and DSA receiver - super short locking shoulder

twistedneck · January 20, 2009, 17:15

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, 20:13

One Argie barrel I worked on had an extremely long breech. Would a breeching washer bring it closer to a normal size? Ron

**Brush511** · January 20, 2009, 22:45

Quote:

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.

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.

Sean · January 21, 2009, 11:26

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.

ThunderGod · January 21, 2009, 12:49

The last couple of Denton builds have seen the same thing.

**ocali** · January 21, 2009, 17:33

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, 20:16

i once barreled a dsa type 2, with 3 differnt barrels , 3 differnt bolt & bolt carriers, everytime. .250.

twistedneck · January 24, 2009, 04:43

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

patriot1177 · January 29, 2009, 22:43

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/showt...ghlight=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, 21:47

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.

January 21, 2009, 17:33	#6
ocali 67N / CATM Contributor FALaholic #: 26646 Join Date: Feb 2007 Location: Florida Posts: 155	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. Last edited by ocali; January 22, 2009 at 15:41.

January 21, 2009, 20:16	#7
fal fiend Curio & Relic Bronze Contributor FALaholic #: 7091 Join Date: Aug 2002 Location: Indiana USA Posts: 2,266	i once barreled a dsa type 2, with 3 differnt barrels , 3 differnt bolt & bolt carriers, everytime. .250. __________________ In memory of a true friend, Derby Fals 1956-2007/ I'm a Contributor, u should be 1 too, support the Fal board.

January 29, 2009, 22:43	#9
patriot1177 Registered FALaholic #: 15381 Join Date: Sep 2004 Location: Angelina County, Texas Posts: 83	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/showt...ghlight=Arg%2A If you use the regular taller Argentine front sight block it will need the tall Isreali front and rear sights. Last edited by patriot1177; January 29, 2009 at 22:58.

January 31, 2009, 21:47	#10
Eric Bryant Registered FALaholic #: 7670 Join Date: Oct 2002 Location: West MI Posts: 2,189	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. __________________ We're the middle children of history, man. No purpose or place. We have no Great War. No Great Depression. Our Great War's a spiritual war... our Great Depression is our lives. We've all been raised on television to believe that one day we'd all be millionaires, and movie gods, and rock stars. But we won't. And we're slowly learning that fact. And we're very, very pissed off. - Tyler Durden

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January 20, 2009, 17:15	#1
twistedneck Registered FALaholic #: 18055 Join Date: Aug 2005 Location: Dearborn, MI Posts: 44	Argentine bbl and DSA receiver - super short locking shoulder 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?

January 20, 2009, 20:13	#2
Ron Walker Registered FALaholic #: 35607 Join Date: Apr 2008 Location: Mathis, Texas Posts: 1,338	One Argie barrel I worked on had an extremely long breech. Would a breeching washer bring it closer to a normal size? Ron __________________ Skypilot Liber aut Mort!! "He's the man we've been taught to hate. He's the solitary American gun nut" Stephen Hunter - Point of Impact

January 21, 2009, 11:26	#4
Sean Registered FALaholic #: 2128 Join Date: Jan 2001 Location: Temecula Posts: 582	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, 12:49	#5
ThunderGod Banned TROLL FALaholic #: 7196 Join Date: Aug 2002 Location: North Texas Posts: 4,819	The last couple of Denton builds have seen the same thing.

January 24, 2009, 04:43	#8
twistedneck Registered FALaholic #: 18055 Join Date: Aug 2005 Location: Dearborn, MI Posts: 44	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