CMMG conversions are also fully compatible with the large supply of Black Dog 22 LR AR15 magazines I already had on hand. One of the leaders of high quality 22 LR conversions has been CMMG, which has created an updated design that is more reliable, more user-friendly, and offers more available optional features such as forward assist and last shot bolt hold open. Although high hammer force is still required for reliable ignition, I lusted for the accuracy potential a dedicated 22 LR AR15 upper could provide. If you want to shoot 22 LR from a standard AR15 lower, the best option is to go for a dedicated upper receiver. The result of using 22 LR AR15 conversion kits is usually frustrating reliability and marginal accuracy. The main reason for reliability issues is that they usually require a higher-power hammer spring to ensure reliability, which then requires very high velocity rounds to provide reliable cycling and charging due to that heavy hammer spring.Īccuracy suffers due to two reasons: the long jump the bullet has to make to go through the conversion adapter before it gets to the rifling and the typically fast twist of an AR barrel tends to destabilize the slower and shorter 22 LR round. 223 chambered rifle, but the sacrifice is that they generally deliver poor accuracy and reliability. They technically allow you to shoot 22 LR ammo out of your. 223 to 22 LR adapter Atchison/Ciener style conversion.ĭrop-in conversions are simple and allow you to use your existing AR15 5.56mm barreled action with just a bolt and magazine swap. Another option is to build a dedicated upper or use a drop-in. The first is to buy a dedicated 22 LR AR format rifle such as the S&W M&P15-22 or one of Umarex’s Colt 22 LR models. For the AR15 shooter, there are a couple options. Now that our beloved 22 LR ammo seems to be coming available again at reasonable prices, we all want to shoot more of it. Building a Custom Dedicated AR15 22 LR Upper
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