The K22 is the first in a series of 22 rimfire AR15 products that Olympic Arms began designing just a few months ago. Basing the progression in technology on the tried and tested military M261 design, the K22R uses the same carrier assembly, but the difference in accuracy, reliability and longevity is in the barrel. Rather than have the old two piece bolt carrier system as in the M261 and Olympic Arms' Rimfire Adapter Kit, the K22 system uses a dedicated barrel.
In this case, rather than having a separate 'chamber end' on the carrier assembly that inserts into a standard 223/5.56 chamber, this system has a one-piece barrel with the appropriate chamber-end machined right into the barrel. There is no barrel extension like in a traditional AR15 barrel, and no separate chamber end on the carrier; the rimfire carrier assembly mates right into the barrel!
Standard with a 17.5-inch bull barrel free-floated under an Olympic Arms manufactured aluminum free-floating handguard, the K22RTM sports a mil-spec picatinny flat-top upper receiver, standard AR15 lower (no modified parts in the lower whatsoever), and a gas-block ready barrel turned to the standard bull diameter of 0.930 inches.
