I have three AR's with BUIS's, GG&G, Troy, and MI, all are great, I found the GG&G to lock in the upright position a little tighter, MI are a little "springy" but it stays in place. I have not tried the BUIS's from Magpul, they are relatively "affordable", personally I prefer GG&G becuase they are made right here in my hometown.
FR
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