![]() ![]() 223/5.56-hybrid chambers occasionally have issues with stuck spent steel casings. 223 or 5.56mm ammo to get stuck as the metal heats up. Differences in headspacing between 5.56 and. The best way to avoid extraction problems due to stuck cases is to use an AR-15 with a 5.56mm chamber. Steel-cased ammunition is a great resource for inexpensive shooting. In other cases, it may be necessary to use zinc-coated steel-cased ammo such as Silver Bear. Switching to modern production steel-cased ammo with polymer coatings sometimes alleviates this problem. As heat begins to build, some AR-15 rifles start to have problems with lacquer-coated, steel-cased ammo. To help prevent rust and corrosion of the cartridge case, older steel-cased ammo is lacquer finished. Steel-cased ammunition is available with three different types of coatings. ![]() Using a lower-weight buffer or a lighter buffer spring may also be necessary when shooting steel-cased ammo. If this becomes a problem, switch to brass-cased ammo. Some AR rifles have smaller gas ports and will not cycle well with the reduced-power loads found in steel-cased ammunition. Steel-cased ammo is generally loaded lighter than standard military loads, so it is important that the AR’s gas system runs well. You will also need to clean the chamber with a good M16/AR-15 chamber brush. It is usually a good idea to remove the extractor to clean underneath as well. Thoroughly clean your bolt, paying close attention to the bolt face and extractor. Because steel-cased ammunition results in more carbon build-up, it’s important to use a high-quality solvent such as M-Pro 7 along with a synthetic lubricant. ![]()
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