Aleksander ... You said your original buffer was a H2 buffer. Was that a standard Carbine type buffer? I have a VLTOR A5 receiver extension on my 6.5 Grendel AR with a Magpul UBR Gen2 stock. The instructions I had for using the A5 extension said to use the longer VLTOR buffer & a standard rifle spring. The VLTOR buffer is about .75" longer than a standard Carbine buffer. My set up seems to be working OK. Haven't had any issues with bolt lock-back with factory ammo. It has an adjustable gas block that is set to fully open to get things working OK. I'll probably put a regular gas block on it eventually since the adjustable block seems to be of no real improvement.
I'd follow grayfox advice & go to a Carbine extension with a standard gas block. Start with a standard Carbine spring & a H1 buffer. You can replace parts as needed to improve function.
EDIT: Ooops didn't see your last post before I hit the send button. Glad things are working OK now.
I'd follow grayfox advice & go to a Carbine extension with a standard gas block. Start with a standard Carbine spring & a H1 buffer. You can replace parts as needed to improve function.
EDIT: Ooops didn't see your last post before I hit the send button. Glad things are working OK now.
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