Solid build. I put it on a Black Rain lower. I had to take a dermal and file down part of it so that it would engage properly. I think if they reworked the design a little then fitting wouldn't be necessary. It works flawlessly now. I doubt all lowers require fitting like my Black Rain lower did.

Works perfectly on my R25 using pmags. Easy to install and functions beautifully. Well worth the price imho.

I bought the 308 version and decided to try it in my Ruger 556 anyways. It fits well and locks back with Pmags every time. I wonder if it might have issues in Non Mil spec uppers as the sidewalls might be thicker and not allow it to pivot far enough to get in front of the bolt.

I purchased this bolt release despite some of the negative reviews, and I am glad I did. I am building a 308 on Aero Precision receivers( DPMS LR308 spec), and this product fit perfectly. I did not have to make any alterations. Installed easily, looks and works great. I feel that the problem others are having is due to the fact that the 308 AR is not mil-spec so there can be many variances between manufactures. All you can do is try it, if it does not fit, return it and try something else. That is all part of the wonderful world of customizing. Good luck and happy building!

I was a bit leery after reading some of the reviews, but still decided to use it on my build. I did make sure to polish it with 600 grit sandpaper and treated the entire lower and parts with froglube prior to assembly. When I dry fit it prior to polishing it, it was a very snug fit, and I can understand where it would cause issues. However, if you put the extra care into it beforehand, it should work phenomenally. I've put over 400 rounds (over 20 mags) through the gun, and I've never had it fail to lock the bolt back. Also, while it holds the bolt quite secure, it doesn't take much pressure to release.

I like the idea and looks but they are hit or miss as to working properly .I think the mass of weight is just to much for it to lock quick enough on last shot to lock bolt back .

Your expert service said this item would work with a Ruger SR762. I ordered it and found that it would NOT hold the bolt open unless I did some grinding with a Dremel, which I did. It now works but I had to make it fit as it would not open up enough and therefore would barely hold the bolt open, often closing within 1-2 seconds. Do not buy this item for this rifle unless you know how to grind small parts with a Dremel. It will NOT work as a stock item.

Installed it on cmmg lower dpms upper. Installation went smooth at first. Pulled back on my charging handle and would not catch the bcg. I noticed that the left side of the bolt release ( vertical part ) was rubbing against the lower. I had to file / sand down the sides of the bolt release quiet a bit to clear the lower. It works fine now but the strength / integrity of the bolt release has been compromised a little. I would still use this set up on my gun...still beats the standard release.

I recently completed a .308 build on a JD Machine lower and this Phase 5 item is pretty much the only game in town if you want a B.A.D. lever on one of these. I've used the Phase 5 on a .223 build without issues, but this application needed a little tweeking and massaging to fit properly even though I was using the appropriate .308 version. Out of the package, this item contacted the lower just slightly, but just enough to prevent the carrier from locking back on an empty mag without manually intervening. After bending the whole lever out just a tad, it now works fine.

I found out that most SIG AR platforms will not accept the Magpul extended bolt release extension that clamps on the stock bolt release lever. I got two Phase 5 releases (5.56 and 308) and both fit on to my Sig 516 and 716. They replace the entire bolt release lever and eliminate the wobbliness felt in the Magpul clamp on version. They are a little tricky to put on due to the location of the roll pin holding it place. Be patient and have the right tool. Brownell sell a roll pin punch designed for the bolt release roll pin. Remember to put protective tape around you lower.

Unlike their AR-15 model (100-004-899) this didn't work for me so well.

First, it's not one-piece machining, but rather a cut-down regular bolt catch with the extension welded on.

Second, and the most important point, is that without modification this device would not hold the bolt open on Armalite AR-10. Looking at the original and this catch side by side it becomes obvious that the dimensions are different -- the extended catch is smaller vertically. As it appears that this device is made from an existing bolt catch, it must be from some other model, not Armalite's. From another review it seems that it's not DMPS either.

I finally made it work by enlarging the roll pin hole to about 1/8". It was a tedious process even with a carbide bit, because the part is made from hardened steel.

I still recommend it though, as there is no alternative on the .308 platform.

This kind of device improves ergonomics tremendously.

This device is great, but edges are sharp and could be smoothed out a bit. I placed one on an AR-15, and it needed some additional bending to allow the bolt to catch before it hit the bottom of the lower receiver.
It works great now, and I prefer it to any of the bolt one models.

Great sigle piece construction. Brownells GET THEIR AMBI CHARGING HANDLE.

Installed on a dpms .308 and it would not hold the bolt open. Then installed on a mega mono upper and it work perfectly.