SLR's products are top notch and I have a few but for my last and any future builds I will be using the Suprelative Arms adjustable gas blocks.
They are cheaper then SLR and keep the detent mechanism outside of the gas block so they can not get gummed up. The Suprelative has the ability to restrict gas entering the block like most adjustable do but also has another set of detents that allow the full amount is gas into the block while forcing the selected amount of excess gas to vent out the front of the block under the handguard.
This further cuts down on recoil and is an added bonus if you may ever suppress the rifle as the can isn't left to deal with the excess gas.
For the OP they also make .875's in clamp on and solid set screw designs.
