I shot the G21 in an IDPA match last weekend; while not out-and-out disasterous, and no DQs or any other egregious penalties incurred, my performance was sub-par, particularly compared to how I shot with my P320 X-Carry with a RDS the previous weekend.
I had a good daily dryfire program leading up to the match. Particularly exasperating was my inability to knock down a pair of steel plates some 20-30 yards out, with multiple futile shots expended in the effort.
The next stage, after I shot the stage, I reconfirmed zero. Zero was fine, but shooter had a tendency to shoot low-doubtlessly due to poor trigger control/too hasty shooting/poor sight picture/all of the above. Once I tightened things up, POA/POI zero confirmed, but my score was pretty much toarched by that point for the day.
Again, my G21 is a Gen 3, running with Warren/Sevigny Carry sights, a Waren Grip Asist Sleeve, a dot connector, and a coil trigger spring. Thinking dire thoughts, musing on various hardware solutions, I instead (at the advice of a friend and coach) went to a square range and practiced as the gun is.
Hmmm; amazingly enough, when I concentrate on trigger control and sight picture, the center of the target develops one ragged hole, repeatable at various distances. I also utilized the technique of placing my support hand's pinky finger on the front face of the magazine baseplate pad, immediately beneath the receiver frontstrap, which semed to provide more control, both in the vertical and horizontal recoil torque planes.
The Gibbs headslap comes from not live firing to confirm and refamiliarize before serious use, particularly after a protracted period of non-use on the platform. We have met the enemy and it is us.....I can probably get away with it with 9mm, but not with a .45 ACP or .40 platform.
While the fact is that I simply don't achieve the immediate natural index with my G21 that I do with my HK P30L and VP40, I can overcome that with practice-but it has to be a mix of dry- and live-fire. Lesson learned.
Best, Jon
No live animal were killed in the process of this response, nor were any discretionary dollars or futile efforts spent on chasing wil-'o-the wisp hardware solutions ...