![]() This might be the best all around solution for your loose and wobbly receivers. Take a look at their website for more details. Just know that the oversized pin will likely take the slop and wiggle out of your receivers it will also likely be more difficult to remove. ![]() Oversized pins will remove much if not all of the slack in a loose receiver set while undersized pins will help with easier takedown of overly tight receivers with excess finish buildup. Oversized and undersized MicroFit pins are offset slightly over. There are three pin sizes available: undersized, standard, and oversized. To gauge the pin fit for your receivers, you can use standard takedown pin or use some gauge pins.įor the AR-15, Mil-spec pins are roughly equivalent to a. These replace your standard takedown pin to provide a tight tolerance fit between your receivers. JP Enterprises addresses the loose fit issue with some precision machined pins called MicroFit Pins. In some cases the gap between the upper and lower receiver (caused from the upward pressure of an o-ring for example) can cause the rifle to malfunction due to misalignment between the carrier to buffer. Some of the previous solutions rely on applying pressure between your receivers, this does work well but can have some drawbacks. This puts your upper and lower receiver in tension making the fit tight which reduces or eliminates all wobble. It is similar to the Accu-Wedge in that it works in the same way and is installed the same way.Īll you have to do is position a spongy rubber ear plug in the back of your lower receiver where the upper receiver takedown lug sits. This is partly because it is effective and partly because most people have some ear plugs laying around. This has been a preferred method to eliminate the wobble and rattle associated with loose upper and lower receivers. ![]() If you need to trim it start at the bottom rather than the top. There are knock-offs that do not last as long so be sure to get the higher quality versions like Brownell’s Accu-Wedge available for roughly $5. I know some people have to slightly trim the wedge in order for the takedown pin to be installed, although the fit should be tight to produce the best results. This pushes the upper receiver up and forward to reduce or even eliminate any wiggle or wobble. It is a wedged piece of rubber that sits in the back on your lower receiver where the rear lug of your upper receiver sits. Many people love the Accu-Wedge since they last longer than the o-ring trick and do not cost a lot cash. If this occurs you must remove the o-rings and try another method. With that said this is not my preferred method as it feels a little too “redneck” for me, and can cause issues with rifle cycling properly. This is easy to do and worth a shot if you just cant stand a sloppy fit, I recommend these orings. This acts as a poor man’s shim and produces a tighter fit that will snug things up noticeably.Īlthough very cheap to do, you have to replace the o-rings nearly every time you remove your upper receiver. One of the most popular methods to reduce a sloppy fit is to take a small o-ring and stretch it over the pivot/takedown lugs. Tips to Reduce Loose Fitting Receivers That Rattle The AR-15 O-Ring Trick The fact that your upper and lower receiver wobbles a bit does not mean anything is wrong with your rifle, it is in fact very normal and common for the AR style rifle. In order for this to happen a certain allowable tolerance range exists and parts can fit on the tight side, loose side and everything in between. ![]() Each part that is Mil-spec is designed and built to a certain standard ensuring a proper fit between components. One of the great things about AR-15’s is that there exists a standard specification for the parts that allow interchangeability between hundreds of different manufactures. Why Does My Upper Receiver Wiggle and Is This Common? ![]()
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