An adjustable gb such as the syrac should allow you to tune your rifle pretty well with whatever buffer and spring combo you want to use. I've used an H2 and a carbine buffer with a bcm carbine spring, spikes carbine spring, and palmetto carbine springs with a couple of different 10.5 barrels (noveske and lothar walther) both suppressed and unsuppressed. I've never had an issue. I run bcm extractor springs in all my BCG's. I think you'll find that the 10.5/10.3 isn't as finicky as some might lead you to believe, at least in my experience, 10.5's have run like champs with a wide range of ammo.