Dec 14, 2024 · Hk416A5/m27/brn-4 m27/black ops defense clone bayonets. A5 and black ops clone are to large and are sized for the heavy profile of the mr556 profile thickness. M27 and …

Oct 6, 2024 · No brn-4 op rod issue until I opened gas port to 1.8mm to get last round hold open. Op rod over traveled compressed to far blew piston rings on 2 different pistons. I replaced with …

Jan 4, 2021 · I can tell you from experience that If you start cerakoting parts and using genuine HK parts you'll end up with in arms reach of just flat out buying a used unmodified stock …

Sep 8, 2024 · Apparently Brownells appears to be releasing their new run of the BRN-4 lowers soon, they've just added the listing on their website over the weekend from what I can tell. …

Jan 30, 2024 · I’m sorry to say the Brownells BRN-4 BCG is out of commission after 500 rounds. For the price it was a great option for a build. I didn’t have any problems until around the 450 …

Jan 21, 2022 · Thanks. That’s definitely not a lot in relation to other AR lower manufacturers. I saw a BRN-4 lower with mostly HK parts and Gen 1 stock sell last week for $2,500 but it had a …

Apr 15, 2019 · I have a BRN-4 lower from Brownells and intend to have a person engrave the lower to make it a semi 416D clone, to match an HK upper I recently purchased. I have a …

Nov 12, 2023 · My 10.4" BRN-4 barreled upper shoots about 1.5-2" groups with IMI 77gr razorcore and an unmagnified eotech at 100 yards. IMO that is perfectly acceptable for what I …

Jan 1, 2021 · MR 556 / BRN-4 Bolt Review and Survey Jump to Latest 5.1K views 15 replies 8 participants last post by Gatsby177 Feb 7, 2021

Oct 30, 2023 · This series of post is about my experience with 2023 BRN-4 barrels BRN-4 small parts and BRN-4 upper receiver. Problem was with an improperly machined BRN-4 uppers / …