Magpul does not make any "clips" Most 300 blackout will work in most 5.56 mags, but not all 300 will work in 5.56 mags. If you experience feeding problems, take a look at a loaded magazine to see if the cartridges are being pressed out of alignment by the magazine ribs. I can manually load a shell by hand and let the bolt release and fire with normal extraction. The idea behind the .300 Blackout was to try to fix all these problems while retaining the format. March 18th, 2020 at 9:04am. I have it set up that way. If I put the same round in a magazine sometimes I … Hye guys, I was out shooting some new loads the other day, and I had some very frustrating results. It can take 2-3 minutes at least to fill the tube. Directions say to use the small pistol plate with the two washers installed for 300 Blackout. Some bullet manufacturers, like Barnes, have developed projectiles that are shaped specifically to feed properly from standard magazines. It is a dedicated suppressor/subsonic platform. I just built a 10.5" .300 Blackout AR pistol. Suggest that you pick up a few aluminum/metal mags IF you have feeding issues. 300 AAC Blackout ; 10.5" Pistol Build Feeding Failure Sign in to follow this . 300 Blackout Feeding Issues: Differential Diagnosis? The plate is not picking up the cases. I have dies, a box of coated 245gr cast bullets from Missouri Bullets, 165-173gr jacketed bullets I bought mainly for .308 and .30-06, 170gr JSP bullets I bought for .30-30, and 110gr plated bullets I bought for .30 Carbine. Followers 1. However, magpul designed new followers specifically for the 300, the mags are a tad different and designed to feed 300 black into the chamber, the geometry is different for 300. Apparently, the story goes that an unnamed special missions unit in the U.S. Army asked for a round that could fit inside a .30-caliber rifle, and would be usable with any AR weapon. Double feeds. I would be curious if the mini's in blackout have some of the same magazine issues as the AR's. Even using magpuls, I have feeding problems with a full 30 round mag. The big issue is how front-heavy a 220 grain on the front of the cartridge. I have an older collator. I built a 300 Blackout SBR a couple years ago. 300 Blackout feeding problems. ... All had feeding problems in one way or another but they all chambered fine when hand fed. When I first got it, I had some problems with the first round in the magazine not feeding correctly. Had feeding problems again. It seems what I thought was a chambering issue was really a feeding issue but it presented at first like a short stroke or chambering problem. I don't think this is a gas problem - I think you had a mag problem. Went out today with it and messed around with it. 300 Blackout Chambering Issue Hope this is in the right spot. First, I have a blackout, but it is on an AR platform. Not cycling back far enough to stip off a round from the magazine. I loaded the first mag of 4 I took with me (all PMAGS I had used before), and attempted to send the bolt home. 10.5" Pistol Build Feeding Failure. I have a 300 Blackout I am having feeding problems using Missouri Cast 300 Blackout - Hi-Tek .309 Diameter 245 Grain RNFP. I discovered that I could load 6 rounds into the magazines and that I had not been counting them into the magazine. The .300 Blackout started out as a military round. Always had feeding problems. But the same problems happen with polymer mags and higher grain'd 5.56.. From what I've been told. It would not feed correctly and the nose of the round would shoot up too high and miss the chamber.

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