![]() ![]() You will shave metal on some - on others you are simply crushing metal. If you get one of these (2 of my 3 were like this) there is NO AMOUNT OF TAPPING THAT WILL MAKE THE UPPER FIT. Or at least let you know they were shipping ones that wern't finished!īut let me be clear as some others have. Perhaps someone grabs a lower from the wrong tub for shipping - OR they ship it without the finish milling figuring we would rather have a nice tight fit by finish milling ourselves.Įither way would be OK with me if they would just ask when you order which one you want. Now maybe they have their lowers shipped to them without the final mil-spec milling because they want to do it in-house and make the fit between upper and lower nice and tight. They pretty much assemble as they go with orders. I know that RRA does not build huge batches of guns like some others - at least I have heard from several sources that is true. Since I started all this I have built two more RRA lowers. Both my builds fit like a glove with absolutely NO PLAY and do not require any extra force, hammers or any other bs to take down. After shooting a few hundred rounds through it everything loosened up just slightly all is well. With a little work doing the above and a little time, it fit. The second was an extremely tight fit that didn't allow it to come anywhere close to fitting together for a while. The guys at RB Precision are very helpful. You may have some difficulty separating the upper and lower, with barrel up and rifle unsupported (hanging in the air) grasp the rifle by handguard and give a "smack" to the top of the buttstock, you may need to do this repeatable, usually 5-10 times will do the trick. ![]() You may see some of the anodized removed from the rear lug at the corners, AGAIN, this is normal.Ĩ. This will seem scary to a beginner but it is natural for a tight fit.ħ. When they are seated (little to no gap between upper and lower) lightly tap the rear takedown pin into place. ![]() Open and close, repeat being careful to keep the halves aligned, do not slam them together but continue to use increasing force to fit together, when almost completely together use a nylon or soft rubber mallet to tap upper receiver into final position.Ħ. Slowly push the 1/2's together, they will stick (THIS IS NORMAL) it will most likely not close completely at first this is normal.ĥ. Ensure the rear takedown pin is completely out in the open position (detent is holding)Ĥ. Lubricate the rear lug completely with a light grease (best) or oil, lube the inside of the receiver also.ģ. Assemble the front pivot pin to the upper.Ģ. Works every time.Īll of the Rock River Arms lowers are an extremely tight fit, they need to be worked in the following way :įor the love of God make sure there is no rounds in rifle and it is on safe, the hammer will need to be back in the cocked position!!! Our lawyers make us tell you that death is possible if this is loaded when you perform this, we like our customers please do not shoot yourself!ġ. I use this method during assembly rather than removing metal from the lower receiver or the upper receiver lug. The following is from RB Precisions website. Unless I hear different, I think that will be my last Rock River stripped lower. ![]() It looked like they just didn't get the lower machined out in the rear area. My question - has anyone else seen this kind of problem? In all my builds, I never had. Finally got it cut out so it will now allow any upper to close on that lower. The upper would lack about 1/4 to 3/8 inch closing. (cutting out the lug relief area on the lower).īTW I had tried several uppers and all did the same thing. So out comes the Dremel tool and off comes the aluminum around the area where the lug on the upper goes down into the lower. Well, I studied it some today and decided to just machine it to fit. In fact, it was so tight I had to use a rubber mallet to get the upper / lower to shotgun open and would never close 100%! Upon attaching the upper, I discoverd a VERY tight fit around the rear takedown pin between the lug on the upper and the slot in the lower. I got a new RRA stripped lower and finished it yesterday. I'm not sure if this belongs here or in the Build it forum, but here goes. ![]()
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