So main differences - A400 XTR plus use Stelium plus barrels with longer forcing cones than of that found on the 1301 pro. Means the XTR Plus will have perceived recoil reduction and better shot pattern. The XTR plus also has the kick off mega as opposed to kick off plus, so more recoil reduction through the stock.
If i was in your position, I would run an XTR plus with maybe a shorter barrel if you are that way inclined. A 26” would be a good option.
Bookmarks