The Ruger Raptor for the Ruger 1022 .22 long rifle caliber rifle has an extended butt section that both accomodates the minimum 26″ overall rifle length, while also providing superb LOP and balance. The trigger ring pistol chassis allows for 25 round mags. Most mags just drop out with the release lever at the front of the factory trigger location mag release. The Ruger BX-25 unit needs to have the ansillary added bulge at the backside (not on their normal mags) filed down a few thousandths.
from Camping & Outdoor https://www.pinterest.com/pin/488359153323984566/