Ar15 takedown pins too tight8/3/2023 The MIL-SPEC captive bearing is made from an increase iron content porous metal that is stronger and more resistant to shock loads than standard oil-embedded bearings. The custom machining of the assembly allows PIN PAL to be built to very tight tolerances. ![]() The pin and nut are machined from 4140 Ordnance Steel for extreme durability. PIN PAL includes a pin, a locking nut and a MIL-SPEC captive bearing. Replacement of an upper receiver is an expensive proposition. Fitment of the upper and lower receivers will become sloppy, making your weapon less dependable. This action will cause accelerated wear on the through-hole in the receiver causing the hole to expand and elongate. The gun manufacturer never intended that the aluminum receivers should be frequently pivoted on a steel front takedown pin. Shooting it won't fix this in any reasonable time frame in my experience.The Cross Armory PIN PAL is designed to reduce or eliminate that wear and tear that will be caused by the repeated opening and closing of the upper and lower receivers, as now required by so-called assault weapon laws in states like California, New York, New Jersey and other states. So yes Sir, this is the best way to do it if they are so tight you have to use a hammer to get then in and out and caused by too much finish on the parts. He polished until he could, with a little effort, get them to move in and out (after being lubed). DD upper, Aero Precision lower, RRA pins. It is no more loose now than it was after I lightly polished the pins. I had to do this back in the 90s on BM upper, EA lower, BM pins. Shooting the gun will be super slow if it works at all when this is the case (too much finish). ![]() Then normal use will loosen them up to where they should be. You just polish it with very fine emory cloth until you can, with effort, push them in and out by hand. Lightly polishing them is the best way to fix it. If the pins have too much (or the receiver has too much) finish material on it it is "out of spec". Shooting the gun is not the right kind of action to wear on the pins since the pins are not moving when you shoot it and the recoil action is perpendicular to the pins movement. Pushing the pin in and out a bunch is more likely to do it than shooting the gun. If you cannot get the pin in and out without a hammer or other tool to help - if you cannot do it by hand using a takedown pin punch tool - it is too tight and 10 range trips will not have loosened it. I believe removing the finish or material where one perceives the problem to be, should be avoided.To each his own. But, like I said after one or two range trips, loosening of the fit should start to be noticeable. I believe removing the finish or material where one perceives the problem to be, should be avoided. If the problem with a tight fit between the upper receiver and lower receiver truly is a simple matter of a thick finish, I would rather have that wearing in of the finish occur naturally from use, and specifically in the areas and amount that naturally occur with use. ![]() Personally, I feel that mechanically removing the finish of the parts should be avoided. Just enough until it becomes easy enough to push in and out reasonably but still has some resistance in it as it will continue on its own to loosen up a little and you don't want to over do it.No Sir, one range trip won’t do it. Use very fine (1200 or so or higher) and lightly "polish" the take down pins to remove some of the excess finish. Or you can do what I have done in the past. You can either just push it in and out a million times and shoot it a million rounds (or some other relatively large number - one range trip won't do it) and it should loosen up some. This is usually because of excess finish material (whatever the receivers were finished with and/or the pin is finished with).
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