Todd told me that the only change that he has recently made to the Sentry 7 is that he has altered the leaf spring material from 6AL-4V Titanium to 17-5PH spring steel.
The adjustment screw, spring capture screw, gas regulator, and the detent spring all appeared to be well machined with no visible flaws or defects.
It was a friction fit that required some working by hand to get it on and positioned properly, which is what you want in a gas block (if it slides on and off like a ring pop, that is a recipe for gas leakage IMHO). The gas block fit perfectly on the gas block journal of my Rainier Arms Mountain Series 18" CHF gov-profile barrel with rifle gas (made by FN). The gas block itself is made from 4140 heat treated steel and is coated in a heavy oxide/phosphate finish that appears very rugged and does not scratch easily. I didn't tell them about my participation here on M4C until just before my departure from their shop.
Though they were busy, customer service is obviously a priority. The rest of the guys in the shop were just as knowledgeable and just as friendly.a good bunch of gun guys they are. He gave me some consult on my expected gas settings, a brief history of the design of the Sentry 7, and then sent me on my way with a meaningful LEO discount. He then handed me my gas block which he had assembled himself so it was ready for my arrival. He is very knowledgeable about AR15's and we spoke for several minutes about my AR, my intended uses, the ammo I would be shooting, gas pressure curves, gas port pressures, my use of the Vltor A5 recoil system, etc. I then met Todd and he took me for a quick tour of the shop. I show up in some sordid attire (covered in mud and soaked with rain due to some PT earlier that day on an O-course) and didn't receive as much as a crooked look from anybody there. I expected him to provide some type of excuse, but he only replied, "Cool. I explained that I would like to buy a Sentry 7 set screw gas block, and that I would like to pick it up in about 20 minutes. I called them while about 15 minutes out and spoke with Todd (the owner) on the phone. They are local to me, in Winter Garden, a Western suburb of Orlando. The SLR Rifleworks Sentry series of gas blocks feature easy disassembly, adjustability and consistent repeatability, single tool adjustment, and a standard gas tube in one compact, sleek, lightweight package.Several weeks ago, I picked up a new Sentry 7 adjustable gas block directly from SLR Rifleworks. SLR Rifleworks Sentry 7 Clamp On Premium Adjustable Gas Block - Melonite QPQ Finish