@nikdanja
A5 RE are available
The RE-10/A5SR Receiver Extension is a six position receiver extension designed to work with the VLTOR A5 system. This receiver extension is designed to wor
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I like the vltor a5 system but as others mention it’s not going to fix your overgassed problem. dwell time is everything. I personally don’t bother with anything DI unless I can get a rifle length gas system. My 16” Reece rifles now use criterion barrel w rifle gas for this reason.
the best fix for your 11.5 is going to be a mid length gas (not carbine) and either an adjustable gas block or something like the YHM suppressor block which will cut down on gas. I personally do not like AGB as they all seem to seize over time and I don’t like the idea of a possible failure point in gas system.
the following are all band-aid solutions to delay unlock time but none of them actually increase the dwell time, which is the ultimate solution:
-heavy buffers, A5 RE to allow rifle springs, adjustable BCG’s such as bootleg.
another solution is to use .30 cal cans on .223 auto loader rifle. The overbore suppressor will provide much less port pop and sometimes sound better for this reason. The OSS helix design will also run smoothly on your shorty.
if you decide to go with an A5 system start with an A5H3. my RRA 16” mid length will cycle the A5H4 on a cold day with weak ammo. Your 11.5 will still be over gassed even with a heavy A5 buffer.
good luck