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Posted: 6/26/2026 8:47:48 AM EDT
[Last Edit: SSG-69][Edited]
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6mm ARC has been of interest for a bit in my head, and I recently discovered the now archived SureFire ICAR threads. Is it possible to machine a 5.56 magwell to accept the Magpul ICAR magazine? (Yes, I know I could just buy a Sabre set. I have a remaining XYZ billet 80%. Humor my nefarious plans.) |
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I have yet to see specific measurements for the ICAR setup. I would suggest buying a Magpul ICAR mag, and measuring that. |
*Hold on to your AR-15s. Their magic must be very powerful, or they wouldn’t want them.*
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TOGC,IADC
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Originally Posted By m6z: There's not enough material to work with. That's the whole reason for the icar receivers, they're physically longer between the takedown pins. Ok, thanks - useful info. For Mr. Coyote, no broach but a skilled machinist buddy. Looks like I’ll just go with the 6.5 G mags and have at it! |
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Originally Posted By m6z: There's not enough material to work with. That's the whole reason for the icar receivers, they're physically longer between the takedown pins. They are not longer between pivot and takedown pins. A standard AR forging does not have enough material to machine in a six8/ICAR magwell, it's primarily a width issue, front to back the magwell in only a little longer, the bolt catch to pivot pin distance is the same. |
You may find me one day dead in a ditch somewhere. But by God, you\'ll find me in a pile of brass- Tpr. M. Padgett
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I've never had a feeding problem with the Dura-Mags in standard ar lowers. chasing that last 2 rounds of magazine capacity seems silly for a range toy. if shtf I'm grabbing the 5.56 because pickup ammo is a thing. no one will have 6.8spc. for hd and maybe bag gun for work, which is why I built the 6.8spc pistol, I'll run with the 4 mags I have loaded. but chances of ever using it will be between "delusional dystopian nightmare" and "will never happen". |
The deuce you say.
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Originally Posted By m6z: , they're physically longer between the takedown pins.  Attached File Attached File Mags don't need more room fore and aft, just starboard and larboard OP, don't think it will work width-wise. The ICAR mags are the width of 308 mags, but 5.56 length. I can measure for you properly in a bit though. My PSA IC receiver build from last week. Attached File |
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Originally Posted By Atropian_Defector: https://media2.giphy.com/media/hPPx8yk3Bmqys/200.webp?cid=8dc8958c5pqko6cg8zd9bih3pr09dl1vrqkphp8yhdxiwr03&ep=v1_gifs_search&rid=200.webp&ct=g https://www.ar15.com/media/mediaFiles/523616/IMG_3803_jpeg-3783368.JPG https://www.ar15.com/media/mediaFiles/523616/IMG_3804_jpeg-3783371.JPG Mags don't need more room fore and aft, just starboard and larboard OP, don't think it will work width-wise. The ICAR mags are the width of 308 mags, but 5.56 length. I can measure for you properly in a bit though. My PSA IC receiver build from last week. https://www.ar15.com/media/mediaFiles/523616/IMG_3909_jpeg-3785886.JPG Nice stick. Thank you kindly. The blank is one of these; they were formerly made by an aerospace company that made rocket engine parts… some of the owners are gun guys: https://www.xyzarms.com/ |
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