BROWNELLS - BRN-4 HK416/417 Upper Receiver OP Rod Bushing

I just installed this bushing on to the BRN 4 upper, it stopped after 1 turn by finger so i used a little aeroshell. I had to use a flat head screw driver but there is PISTON ROD GUIDE BUSHING INSTALLATION BIT type tool out there thats made for this bushing. Just be careful if your screw driver if it does not hold both slots, go slow so you don't damage the bushing. You also have to make sure this bushing sits far enough in so your barrel nut does not bind. Use a flashlight or paper to make sure you have a slight gap.

I don't know if it's the upper or the bushing, but this was extremely hard to get in, even when using oil. I was afraid I was cross threading it, but that wasn't the case. It would also be helpful if a wrench was included that exactly fit the slot because a regular wide screwdriver doesn't work well. I eventually messed up the slots a little while trying to get it fully screwed in because the threads were so tight, but the raised edge on the front face doesn't interfere with the op rod. The BRN4 line still needs work as far as coatings/ quality control in my opinion, my new chrome/phosphate BCG has an oblong firing pin hole and now the bushing was insanely tight. None of this will affect function, but the fact that their manufacturing is off for a part that's not too different than the millions of ar15 parts made is annoying.