I've never used the Bootleg but I have 1000's of rounds through 3 AR's with Geissele fixed gas blocks and Rubber City Adjustable Gas Key BCG's and H1 and H2 buffers depending on sbr or 16" barrel.
I will never use an AGB again and I've used them all for many years.
I can tell you that the RCA AGK BCG fixes and overgassed upper like any AGB. I actually just built and upper for a forum member
@Emc_2015 with this exact setup because he was tired of his overgassed AR's. Received the upper and said damn this thing is smooth as shit, no beat to shit brass, runs great. He's shooting 100% supressed.
They use an adjustment screw, you simply turn the adjustment screw all the way down till it bottoms out (gas closed) then open 1 full turn. Takes me 5 shots or less to tune the gas, fire 1, see if it locks back, if not, pull rear take down pin, slide bcg out, turn screw 1/4 turn more, shoot another round. If it locks back, I then open it another 1/8 turn for reliability as it gets dirty then I fire 30 rounds or so in 5rd increments to ensure it locks every time. Once that's done, there is a second screw you install that locks the adjustment screw over the long haul so it doesn't ever move. Change barrels, change cans, change ammo, etc. No more worrying about carbon locked gas block screws, slide bcg out, remove lock screw, open or close gas to your new setting then reinstall lock screw. Very easy, quick and painless
I can't recommend the RCA AGK BCG enough. Lifetime warranty and one of the best coatings in the business. Wipes clean with a rag...
You can also buy their adjustable gas key separately and install on your bcg if you want. I've never done that, but they do sell it separately.
Made from Pre-Hardened 4140: 28-32RC with radiused corners reducing sharp edges. Enhances performance of low mass and standard mass GI systems without unnecessary dissassembly. Gas flow is adjusted and maintained at the carrier with set screws. One to adjust gas flow and one to lock it in place...
rubbercityarmory.com