![]() ![]() Assuming it is installed properly, the upper receiver should not have any more room to move up and down away from the lower, and thus the axis differential between the bore and the stock should remain more consistent during firing resulting in more consistent accuracy. With the Accu-Wedge installed, you can grab the receivers by hand and wiggle the two pieces slowly canting them side to side but shaking them will not yield a rattle like a pair of loose receivers will. Installed properly, it dampens quite a bit. It does not remove the slop, but it certainly dampens it. Nonetheless, when it comes to shooting competitively, hunting for food, or defending life, it is better to have it than to not.ĭPMS Panther Arms sells a “slop solution” in a low cost, easy to install, drop-in device called an accurizing wedge or what most of us have come to know as the “Accu-Wedge.” This small, flexible, and always-colored-red wedge mechanically adds upward and forward tension to the takedown lug. For more accomplished shooters, the difference is still yet hard to measure and can easily be eclipsed by a strong cup of coffee. Most average shooters will find that these methods provide little more than an anti-rattle solution. Though the barrel is really the component that will determine 80% of a gun’s accuracy, the little details will make the ounce of difference necessary when you as a shooter need just a little more. Today’s article will focus on three known methods for shoring up the fit between the upper and lower receivers to reduce the “slop” and maximize the receiver set’s potential for solid accuracy. The real question is how to harness that potential. Does that mean your “Frankengun” will not achieve the same performance as an out-of-the-box rifle? Your home built rifle has the same potential for accuracy and consistency that any store bought gun does. Of course some finishers are so dialed in they can achieve very close finishes in even separate lots. Complete manufactured guns will tend to have a more reliably tolerable fit as well as matching finishes and most manufacturers understand that blasting and anodizing of receivers will often need to be done in the same batch in order to have exactly matching finishes. ![]() It is that kind of attention to detail that will result in the reputable performance that Mark LaRue’s guns always seem to deliver. LaRue Tactical goes the extra mile and makes sure their guns are built to such exacting tolerances that a new gun will almost certainly need a tap or two from a small hammer and nylon punch to break the takedown pin free. Now that isn’t always the case with manufacturers of complete guns, especially in the consumer (non-military, non-LEO) market. So generally speaking, because these parts must fit each other and must do so every time, the manufacturer will be sure there is enough room for pieces to reliably fit together. A Colt lower fitted to a Sabre upper with an FN barrel and CMT parts should have the same relative fit and performance as an FN lower with a Sabre barrel and a Colt upper. As a military armorer, to be able to swap and mix parts from different manufacturers of the same weapon system is an invaluable characteristic that saves on cost, training time, and reduces the logistical footprint of having to manage and maintain these guns. In fact, most manufacturers will bias the fit slightly towards loose to ensure fit regardless of the mix. Both are high quality manufacturers that build excellent parts and well within tolerance. It is no slight on Spike’s Tactical or BCM. When the receivers came in, the pieces fit together as well as could be expected from unmatched pair, but they were not as tightly fitting as his original gun. Because of the nature of how the pieces go together and because of the acceptable variances in manufacturing, you will almost never be able to replicate the fitment of a receiver pair.įor example, a customer of ours was so pleased with the way his Spike’s Tactical lower receiver fit on his Bravo Company Manufacturing upper that he wanted to build another gun with the same pair. The fit is never the same even when the fit is good. Tightening the Fitment between the Upper and the LowerĪs an AR-15 builder and especially as a builder in the retail market, Shield Tactical has seen just about every mix and match of upper and lower receiver you can imagine. ![]()
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