This is what 2A Armament says:
New for 2018 is 2A Armaments AR15 22LR product line. The 2A Armament 22LR product line is engineered for the highest quality, most reliable AR 22LR platform on the market.
This ultra lightweight AR 22LR Conversion Bolt Carrier is perfect for those who already have an AR15 and just want a drop-in replacement to be able to fire 22LR through their existing AR15 rifle. This conversion bolt carrier incorporates precision machined parts, each with carefully selected materials for its function. This patent-pending design features a titanium bolt, stainless steel barrel collar with 5.56mm chamber plug and other parts, dual balanced reciprocating springs, and a polymer buffer providing a very lightweight and reliable option. Please see "22LR Compatibility" link for the latest updates on any accessory compatibility notices.
Grade 5 6AL-4V Titanium Bolt
Stainless steel collar with chamber plug, ejector, extractor, firing pin
High strength polymer buffer
weight 8.2 oz
NOTE: This AR 22LR Conversion Bolt Carrier is designed as a drop-in replacement bolt carrier on an AR15, and requires a 2A Armament AR 22LR Magazine or a compatible magazine for operation.
$272.00 Regular Price