Posted: 6/5/2014 10:54:44 PM EDT
Do you guys do custom orders? I thought about building my own / ordering separate uppers and lowers, but I have run into issues in the past w/ upper-lower fitment being less than ideal.  I am thinking about getting a pistol lower with the Sig brace, along with this: BCM Standard 11.5" Carbine (Light Weight) Upper Receiver Group w/ BCM KMR 10" Handguard (NFA) http://www.bravocompanyusa.com/BCM-11-5-Carbine-Light-Weight-KeyMod-KMR10-p/bcm-urg-11lw-kmr10.htm  |
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If you do NOT do custom orders, and/or don't offer the Sig brace, what is the best way to ensure that I get a lower that will fit properly with the upper receiver group above? I know that even among receivers from the same supplier, stacking of tolerances can lead to loose fitting. I experienced this with a RRA build, and don't want it to happen again. Thanks. |
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Quoted: Purchase upper then bring it with you to test fit on lowers at your local gun shop. Hmmm... not a bad idea... I haven't seen lowers at the LGS around me, but that may have changed. Some AR manufacturer / assemblers sell matched pairs, too. I wonder if BCM would sell me a stripped lower fitted to the upper assembly. Ideally, I would just buy a complete rifle and convert it to a pistol w/ the Sig brace. Unfortunately, the douches at BATFE have made this illegal. You can convert a pistol to a rifle, but not vice versa. |
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Quoted:
Hmmm... not a bad idea... I haven't seen lowers at the LGS around me, but that may have changed. Some AR manufacturer / assemblers sell matched pairs, too. I wonder if BCM would sell me a stripped lower fitted to the upper assembly. Ideally, I would just buy a complete rifle and convert it to a pistol w/ the Sig brace. Unfortunately, the douches at BATFE have made this illegal. You can convert a pistol to a rifle, but not vice versa. Quoted:
Quoted:
Purchase upper then bring it with you to test fit on lowers at your local gun shop. Hmmm... not a bad idea... I haven't seen lowers at the LGS around me, but that may have changed. Some AR manufacturer / assemblers sell matched pairs, too. I wonder if BCM would sell me a stripped lower fitted to the upper assembly. Ideally, I would just buy a complete rifle and convert it to a pistol w/ the Sig brace. Unfortunately, the douches at BATFE have made this illegal. You can convert a pistol to a rifle, but not vice versa. This would be the ticket, they would sell like hotcakes. I would have bought one with my last order even though I already had a Mega lower waiting on it. |
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Quoted: Buy a BCM lower. I haven't had an issue with a BCM lower fitting an upper. That's just good luck so far. Most of the big names in AR-15s select upper/lower pairs when a complete rifle is being assembled. Stacking of tolerances doesn't cease to exist just because of a respected brand name. |
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Quoted: This would be the ticket, they would sell like hotcakes. I would have bought one with my last order even though I already had a Mega lower waiting on it. Quoted: Quoted: Quoted: Purchase upper then bring it with you to test fit on lowers at your local gun shop. Hmmm... not a bad idea... I haven't seen lowers at the LGS around me, but that may have changed. Some AR manufacturer / assemblers sell matched pairs, too. I wonder if BCM would sell me a stripped lower fitted to the upper assembly. Ideally, I would just buy a complete rifle and convert it to a pistol w/ the Sig brace. Unfortunately, the douches at BATFE have made this illegal. You can convert a pistol to a rifle, but not vice versa. This would be the ticket, they would sell like hotcakes. I would have bought one with my last order even though I already had a Mega lower waiting on it. +1 |
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Quoted:
Where can you buy a new lower? They don't have them listed on their website. Am I missing something? Quoted:
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Buy a BCM lower. I haven't had an issue with a BCM lower fitting an upper. Where can you buy a new lower? They don't have them listed on their website. Am I missing something? IM inbound. |
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Again, it's great if you are lucky enough to have bought uppers and lowers separately and got a good fit, but that doesn't always happen. I have actually seen video from a manufacturer where a worker had a line of lowers that he was using to fit uppers, or maybe it was the other way around, but the point is manufacturers normally do fit the upper and lower when building a complete gun for a customer. I tried to find a similar video on Youtube, but doing searches for "receiver fitting AR-15", etc., turns up nothing but home gunsmithing videos. Obviously, a manufacturer can demand tighter tolerances to require less fitting, but stacking of tolerances still exists. Period. |