yeah, pinned do hold their place best and are always aligned, but clamp is much more convenient, since you don't have take off the muzzle brake. i have a yhm railed 2 piece gas block with bayonet lug or standard a2 pinned with bayonet lug for sale. if you're interested, pm me.
Favorite range gun for the money - CZ 75B or STI Spartan V 9mm
Go-to carry setup - Walther PPS or PPQ in FIST kydex holster 1AK
Favorite .22LR - Browning Buckmark
"A Sig is like a lightsaber - not as clumsy or random as a Glock."