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Posted: 9/7/2011 1:26:11 PM EDT
I have this abomination of an AR15 called the Carbon15. I have removed the BCG and buffer tube and used them in my pistol. I have since made the rifle a dedicated 22LR. The problem i keep running into is the barrel nut/upper receiver. The size/threads seem to be non-spec. No real surprise. I am trying to find a way to replace the oblong shaped handguards with a traditional railed forearm. Does anyone have any suggestions?
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Quoted:
I have this abomination of an AR15 called the Carbon15. I have removed the BCG and buffer tube and used them in my pistol. I have since made the rifle a dedicated 22LR. The problem i keep running into is the barrel nut/upper receiver. The size/threads seem to be non-spec. No real surprise. I am trying to find a way to replace the oblong shaped handguards with a traditional railed forearm. Does anyone have any suggestions? http://farm3.static.flickr.com/2415/2087112643_504b05b6b4_z.jpg You can't swap forearms on a Carbon 15 for the reason you have already mentioned. |
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Hey, I have a Carbon 15 AR pistol and have the same ugly hand guards, and funky barrel nut. I contacted Bushmaster on what it would take to install a standard rail hand guard set up. It seems like it can be done.
Here is their email reply From: Jim Eden <[email protected]>
Subject: RE: RE: Removing handguard on the Carbon 21s To: "Anthony Rukcic" <[email protected]> Date: Friday, February 19, 2010, 1:08 PM Hi, The Carbon 15 pistols with serial number D12144 and higher have upper receivers with a larger barrel nut thread diameter than an AR-15 handguard barrel nut so the AR-15 handguards that replace the barrel nut will not fit. An AR-15 type barrel nut with the larger threads is # 9349054BN-C15 for $12.95, not listed online, can be installed. Handguards like Daniel Defense, GG & G and Midwest Industries that clamp to the barrel nut could be used. A Delta Ring Kit # 8448712K for $13.95 would be used with the Daniel Defense handguard but I am not sure of the others. Care must be taken when installing the barrel nuts, see attachment, or the receiver threads could be stripped. Thanks, Jim Eden | Technical Support Bushmaster Firearms International LLC 999 Roosevelt Trail Windham, ME 04062 Phone: 207-892-3594 Fax: 207-892-8068 Freedom Group Family of Companies Remington, Bushmaster Firearms, DPMS / Panther Arms, Marlin, H&R, NEF, Dakota Arms, Parker Gun, L.C. Smith, EOTAC, Advanced Armament Corp., Barnes Bullets, INTC Confidentiality/Proprietary Note: This e-mail and any files transmitted with it are intended solely for the use of the individual or entity to which they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be advised that you have received this e-mail in error and that any use, dissemination, forwarding, printing or copying of this e-mail is strictly prohibited. If you have received this e-mail in error, please reply back to the sender advising that you have received the e-mail in error and delete this e-mail from your system. Thank you. Hope this helps, I have not swapped mine out yet do to the fact I would lose the rail on top of my receiver…. goofy set-up 
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It is a Bushmaster Carbon 15, not a PO. The nut and MI forearm would be cheaper than an upper receiver and an MI forearm. After all, I am only shooting .22LR out of it.
$13 nut + $165 MI Gen2 two piece free float forearm = $178 or $99 PSA A3 upper receiver + $9 barrel nut + $165 MI Gen2 two piece free float forearm =$273 |
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