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I've had all 4 of the A5 receiver extensions... The 7 position and 6 position A5 REs from Vltor, the 8 position A5 RE from BCM and the 10 position A5 RE from Magpul.
The nicest finished ones were the ones from Vltor, even the inside of the tube was the smoothest. The BCM came in second in the finish department with Magpul being the worst, but the Magpul had the dry lube on the inside. I can't remember if the BCM did or not. I know that the Vltor ones did not have any dry lube on the inside.
But in the end the Magpul A5 REs won out for me because they had the best coverage of the buffer retainer. The A5 REs from both Vltor and BCM barely covered the very edge of the buffer retainer... It was bad enough to make me feel uncomfortable about it, so Magpul wins despite the lack luster finish as compared to the others.
Last edited by 556Cliff; 09-21-21 at 09:43.
From memory, I believe BCM tube has has an additional hole position so that carbine-size stocks (BCM stocks) can lock fully collapsed against the tube. On the VLTOR tube, the longer stocks like Magpul SL, ACS, STR, etc. will lock fully collapsed. I used to have both, but have since sold the BCM lower.
Here's a thread with some photos: https://www.m4carbine.net/showthread...parison-Photos
BCM more than likely ships with the "0" for liability reasons. Less chance of a malfunction in an under gassed gun shooting weak commercial ammunition. For grins I made a A5H2 into a A5H0. Under a BCM ELW upper the felt difference was very small. The kind of difference that you will not notice after a magazine or 2. Does that make the "0" less desirable? I don't think so.
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