For a fairly reasonable cost (~$300 or less), you can get a conversion kit to change your .45 ... the AR-15. You have to remove the forend and unscrew three Allen screws to take apart the upper ...

The dream of using an AR for small game was getting closer. The M261 Conversion Kit The original ... 40 S&W, .45 ACP and our test model — the .22LR. The Olympic upper matches both the weight ...

The MR556A1 Upper Receiver Kit allows high quality AR-style rifles to be retrofitted to HK's famous pusher rod operating system. An MR556A1 Upper Receiver Kit includes a complete barrel assembly ...

Sturm, Ruger & Company, Inc. announced the availability of three, AR-style upper ... All aluminum parts are Mil-Spec hard coat anodized. The SR-556 rifle and carbine uppers chambered in 5.56mm ...