The compensator on the 22/45 is timed. The 15-22 has a brand new grip, hand stop, and Geissele Super Dynamic 3 Gun trigger.
The KNS pin kit was necessary since the 15-22 polymer lower receiver is thicker than a standard AR-15 receiver. Pins that are too short are apt to wallow out the trigger group holes in the receiver. Geissele does not recommend that any other pins other than the factory ones be used, but in this instance I must take my chances with the KNS kit. The pins supplied with the Geissele triggers are precision machined, and I would normally use them if not for this special circumstance.
Now all that’s left is to practice for the match.
Safe and Happy Shooting to you and yours,