AR 9MM PCC LOWER RECEIVER WITH LAST ROUND BOLT HOLD OPEN

I purchased this lower back in November 2018 and I have to say I am thoroughly impressed with this product. I utilize this lower with an NFA upper, Maxim PDW brace with a JP silent spring buffer and a Brownell 9mm bolt for the core of the firearm and all of the parts work harmoniously. The lower itself is robust and has a nice finish to it. I like the magazine release as opposed to other 9mm lowers I have handled, its beefy and there is no wiggle room in the mechanism. I currently run factory Glock magazines and have no problems loading or ejecting magazines. And last but not least, the feature that really makes this lower shine is the last round bolt hold open (lrbho) feature. What more can I say, it is a 9mm lower that has a fully functioning lrbho. I showed the build to a relative, who is an engineer, and even he was impressed with the simple ingenuity. Plus all my friends who have 9mm ARs without a lrbho want my build. It simply is a lever that catches the “ledge” of the follower and raises the bolt catch. Think of it as an AR 15 bolt catch with one extra part. The threaded bolt catch screw is prone to coming loose, at least on my model, but I think a bit of BLUE loctite or tiny shred of Teflon tape should remedy it if this should occur. Also being honest the only other thing is that occasionally the bolt catch engages prematurely before the magazine is empty. I have tried to replicate what happened by directly gripping the magazine, changing rates of fire, and changing bullet grains but could not replicate it. I could not pinpoint what happened and cannot even reliably say that the lower itself is to blame. Perhaps the tab on the lrbho on my lower was just a hair proud and will wear naturally, which makes me not worry about it at all. Overall this lower is superb. It does exactly what is advertised and cooperates with a variety of different parts. If I do build a second AR 9mm in the future I’m getting another one of these.