02-04-2009, 08:06
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#1
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Quiet Professional
Join Date: Sep 2005
Location: NC for now
Posts: 2,418
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Chopping an Upper Down
About a year ago we received eight AR Upper Receivers. Because of a blunder we received 16" Uppers and not the 10.5" Uppers. They have been sitting in the Box ever since.
I am asking is it feasible to have these cut down to 10.5". I already have the Legal aspects covered. All of our Lowers are registered as SBR"S.
1. Will these perform as well as a 10.5" out of the Factory, after being cut?
2. Doe's anyone know a Company/Gunsmith who can do this?
3. We would also need the Barrel threaded to attach the original Bird Cage Flash Suppressor.
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kgoerz is offline
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02-04-2009, 08:22
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#2
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Quiet Professional
Join Date: Jan 2004
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Quote:
Originally Posted by kgoerz
About a year ago we received eight AR Upper Receivers. Because of a blunder we received 16" Uppers and not the 10.5" Uppers. They have been sitting in the Box ever since.
I am asking is it feasible to have these cut down to 10.5". I already have the Legal aspects covered. All of our Lowers are registered as SBR"S.
1. Will these perform as well as a 10.5" out of the Factory, after being cut?
2. Doe's anyone know a Company/Gunsmith who can do this?
3. We would also need the Barrel threaded to attach the original Bird Cage Flash Suppressor.
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Yes and no.
You cannot just cut the barrels to 10.5", rethread to 1/2-28, and expect the guns to run properly. The pressure, timing, dwell time, impulse, etc. are all different.
A good gunsmith could cut the barrels, rethread them, change the gas port size, check the extraction, add a heavier buffer, etc.
It is possible that they will run without any tweaking, but I would say that it is unlikely to be reliable.
Given the machining and 'smithing costs, it might be more economical to order 10.5" uppers or barrels and swap them out, and sell the 16"ers.
Your call though.
TR
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"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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The Reaper is offline
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02-04-2009, 08:32
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#3
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Quiet Professional
Join Date: Feb 2007
Location: TN
Posts: 933
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As hard as it is to find good 16" barrels right now, I'll second what TR said. It seems that finding 10.5" isn't as hard since not everyone wants to go to the SBR route. With the Gun Ban buying frenzy, I'd bet those 16" barrels would be gone in a week.
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koz is offline
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02-04-2009, 08:37
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#4
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Quiet Professional
Join Date: Apr 2008
Location: 18 yrs upstate NY, 30 yrs South Florida, 20 yrs Conch Republic, now chasing G-Kids in NOVA & UK
Posts: 11,901
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Quote:
Originally Posted by The Reaper
Yes and no.
You cannot just cut the barrels to 10.5", re-thread to 1/2-28, and expect the guns to run properly. The pressure, timing, dwell time, impulse, etc. are all different.
A good gunsmith could cut the barrels, re-thread them, change the gas port size, check the extraction, add a heavier buffer, etc.
It is possible that they will run without any tweaking, but I would say that it is unlikely to be reliable.
Given the machining and 'smithing costs, it might be more economical to order 10.5" uppers or barrels and swap them out, and sell the 16"barrels.
Your call though.
TR
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I'll echo TR, and add that the machine work and testing needed on the port would be more expensive than buying new barrels and having you armorer re-barrel the uppers you have..
There is also the barrel contour,, putting it on a milling machine to get the correct 10.5" contour,, if needed for the attachment of toys,, is not cheep nor advised..
Get you scrounge(S4) to trade them to someone with the 10.5" uppers!!    
My $00.0002
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JJ_BPK is offline
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02-04-2009, 09:48
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#5
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Thats the info I was looking for, thanks All.
We did order 10.5" to replace the 16". But as a LE Agency I don't think we can put the 16" uppers on Guns America to sell 
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Sounds like a s#*t sandwhich, but I'll fight anyone, I'm in.
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kgoerz is offline
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02-04-2009, 09:53
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#6
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Quote:
Originally Posted by kgoerz
Thats the info I was looking for, thanks All.
We did order 10.5" to replace the 16". But as a LE Agency I don't think we can put the 16" uppers on Guns America to sell |
Roger that. You should probably turn them in to your SF buddies for destructive testing over an extended period.
Seriously, you may be able to swap them to another entity or turn them in to your DRMO equivalent.
TR
__________________
"It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat." - President Theodore Roosevelt, 1910
De Oppresso Liber 01/20/2025
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The Reaper is offline
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02-04-2009, 21:25
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#7
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Auxiliary
Join Date: Dec 2008
Location: North Carolina
Posts: 86
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We did something simlar as a test and it did not work well. Weapon had to be run with a surpressor for it even to function correctly(more backpressure). If you just use a crowning tool and cut them itll work. But I wouldn't trust my life to it thats for sure.
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kawika is offline
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