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Posted: 6/25/2016 2:44:56 PM EDT
[#1]
Quoted:
I have a barrel that has a rifle extension in it that I would really like to install in a billet upper that I have that has the M4 cuts. Will it function or is it a total no go? That is the only possible NO-GO configuration. |
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Posted: 6/25/2016 2:51:40 PM EDT
[#2]
ADCO will dremel the feedramps so it will work with an M4 upper. I'm probably going to have them do it on a standard barrel I have, since I already have a few M4 uppers.
Or you could buy a non M4 upper. Your choice. |
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Posted: 6/25/2016 2:57:13 PM EDT
[#3]
That's what I thought, well crap.
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Posted: 6/26/2016 9:55:17 AM EDT
[#4]
Quote HistoryQuoted:
ADCO will dremel the feedramps so it will work with an M4 upper. I'm probably going to have them do it on a standard barrel I have, since I already have a few M4 uppers. Or you could buy a non M4 upper. Your choice. |
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Posted: 6/26/2016 11:40:37 AM EDT
[#5]
Quote HistoryQuoted:
OP: For the cost of sending the parts to ADCO, you could buy a dremel-type tool, a 3/16" grinding tip, some polishing tips and do the job yourself. Its a relatively simple, quick job, plus you will have the tools left over for future work. - CW Quote HistoryQuoted:
Quoted:
ADCO will dremel the feedramps so it will work with an M4 upper. I'm probably going to have them do it on a standard barrel I have, since I already have a few M4 uppers. Or you could buy a non M4 upper. Your choice. Yeah, I looked at the ADCO site and it said we will do it with our dremel for $15 or you can do it with yours for free. I happen to own a dremel tool, what could go wrong? 
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Posted: 6/26/2016 12:53:11 PM EDT
[#6]
Or go this route Rock River Arms Flat-Top Receiver.
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Posted: 6/26/2016 3:02:07 PM EDT
[#7]
I really want to use this upper because I have a matched billet upper and lower. It has a 6.8 SPC barrel in it now but I'm thinking about getting rid of that barrel and using an 18" La Rue that I have.
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Posted: 6/26/2016 3:21:34 PM EDT
[#8]
I have several rifles in the "forbidden" configuration. Out of several thousand rounds I have had one hollow point round hang up on the the receiver cut. Try it and see how feeding from your mags gets along with that configuration.
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Posted: 6/26/2016 3:47:46 PM EDT
[#9]
The ramps in the receiver can be filled in with JB Weld if you don't want to take the chance on messing up a barrel. Once it cures it will be plenty strong and wear resistant.
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Posted: 7/4/2016 12:52:58 PM EDT
[#10]
Well I went ahead and put it together with no Dremel work. I took it out this morning and fired about 50 rounds through it, 55, 62, and 77 gr. bullets, no malfunctions!
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Posted: 7/4/2016 1:22:15 PM EDT
[#11]
Quote HistoryQuoted:
Well I went ahead and put it together with no Dremel work. I took it out this morning and fired about 50 rounds through it, 55, 62, and 77 gr. bullets, no malfunctions! 
Try and do a rapid fire for one magazine. You should ok. |
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