but I’ve also discovered that Ruger has a AR-556 MPR model. It can be bought for about $100 more than the standard model and has upgrades that a make the extra money worth it. Check it out for yourself.
Apparently the delta ring and barrel nut are not mil-spec components; that’s something that could get in the way of certain upgrades, namely free float rail systems that clamp to a standard USGI barrel nut.
Happy with mine. The trigger is sweet.
You have the MPR model? Everything I’ve heard is that it’s definitely worth the extra money over the standard model.