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Posted: 1/7/2021 10:52:20 PM EDT
[#1]
Quoted: I am thinking about an AR pistol in 300 AAC. I definitely want it to be side charging, and in my researching, I find that I really like many of the features of the BRN-180S. For those that have built one into a pistol, what are the options for a folding brace when using a standard AR lower? Also looking for which mags are most reliable for 300 AAC subsonic ammo. I'm aware that my timing sucks to be starting to assemble a new cartridge, but at this point, I'm not convinced prices will ever come down. Any recommendations from those who have put one together? On a standard AR lower, you'd need something like the Law Tactical folder. I went with the BRN-180 lower for my 5.56 version and I'm using a SB TF1913 brace. I use M3 PMAGs with my AAC 300BLK PDW and they feed just fine, no issues at all. |
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Posted: 1/7/2021 11:04:30 PM EDT
[#2]
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Posted: 1/7/2021 11:20:11 PM EDT
[#3]
KNS Precision has a MCX adapter that screws into the buffer location and then gives you a pic rail. You could then opt for any pic rail mounted folding stock. Sig has a few options. Mine BRN 180S is SBR'd but I run the KNS piece with a Sig folding mechanism and Jmac customs skeletonized buffer tube.
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Posted: 1/8/2021 12:55:27 AM EDT
[#4]
Quote HistoryQuoted: KNS Precision has a MCX adapter that screws into the buffer location and then gives you a pic rail. You could then opt for any pic rail mounted folding stock. Sig has a few options. Mine BRN 180S is SBR'd but I run the KNS piece with a Sig folding mechanism and Jmac customs skeletonized buffer tube. This is what I did. KNS adapter w/ flange + mcx Rattler brace. |
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Posted: 1/8/2021 11:44:29 AM EDT
[#5]
Topic Moved
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Posted: 1/9/2021 12:50:40 PM EDT
[#6]
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Posted: 1/9/2021 9:43:41 PM EDT
[#7]
Now I just need to find one.
How about mags? I thought I had read there were some mags that don't feed well with the big bullet subsonic 300 ammo? |
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Posted: 1/12/2021 9:44:50 AM EDT
[#8]
Quote HistoryQuoted: This is what I did. KNS adapter w/ flange + mcx Rattler brace. Quick question - What is the difference for the KNS adapter with vs. without flange? Maybe I'm not reading their information correctly but just couldn't figure out the two. Thanks! ETA - Found it, the flange is for rear take down pin detent/spring. |
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Posted: 1/12/2021 9:54:02 AM EDT
[#9]
Quote HistoryQuoted: Quick question - What is the difference for the KNS adapter with vs. without flange? Maybe I'm not reading their information correctly but just couldn't figure out the two. Thanks! I think "with flange" is for standard AR15 lowers and "without flange" is for other types of receivers that accept AR15 style receiver extensions, but don't have a rear takedown pin. For example, if you wanted to put a folding stock on one of those Mesa Tactical shotgun stock adapters. With flange  Without flange 
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Posted: 1/16/2021 3:06:56 AM EDT
[#10]
Pretty much what the above poster said. They were originally designed without a flange because they were designed for the MCX. The MCX's takedown pin is captured by the pistol grip. As a result, KNS designed one with a flange for other AR type firearms such as 22s, BRN180s, etc.
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Posted: 1/17/2021 1:55:24 PM EDT
[#11]
Mine has a standard lower with SB BTFA and SBA3 with Phase 5 strap.
Works pretty well. |
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Posted: 1/17/2021 8:16:58 PM EDT
[#12]
Post 556 only took me two years, but I don't live in GD.
All the info is appreciated. Does anyone have a recommendation for mags - especially the big bullet subsonic ammo? Or do standard 5.56 mags work well for everything? Also, does anyone know if a Fostech Binary will work with the BRN-180? Is the BRN-180 bolt considered full auto rated - I think that's what the Fostech requires? |
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