I cannot tell much difference on recoil control after I begin shooting a stage, however, for me the gun balances better back into my hand and I believe has made a difference for me with sighting - I didn't really like the slug after I installed it as the radius edge on the bottom hit my hand pretty hard when I was seating mags. I have since moved up to a Dawson heavy magwell that utilizes the same principal as the seattle slug with the added benefit of the magwell - it really balances my G24 well for me and adds some weight which should make some difference in felt recoil, but everyone is their own personal judge on felt recoil.