I sold that upper to a buddy and told him to run full power ammo through it.
First time he took it out it wouldn't cycle and when asked what ammo he said steel cased.
I gave him the buffer and spring set so he could burn it up.
I never stocked up on steel cased ammo when it was cheap and don't plan on buying any these days.
And I have carbine buffers and springs if I need to in a pinch.
Update: I just bought a regular 6 position carbine buffer tube. That A5 tube might be good but I tend to stay with what I already know works good instead of trying something else. Kinda like the bcg that I just bought. I keep hearing about the good deals on microbest and tool craft and I'm sure they are great bcg but I decided to pay a little more for on that I already know is good to go. I bought a LMT bcg for $181. It cost more but I have no doubts in the quality.
It's a rifle spring and rifle weight buffer(A5H2) in a collapsible stock, nothing more or less.
Same results as when using a fixed stock.
The A5 does have some adjustability with 5 different buffer weights if needed.
I'm thinking about removing one and use an A2 stock, I don't really need to collapse it and I like the A2 stock.
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