Dukeydog, there are several minor modifications you can do to make your SGL21 A better rifle - Simple things that should of been done at the factory/Arsenal.
I know there's some that are afraid to work on their own guns, and if you are, don't... but if you feel capable, don't let anyone tell you you can't, or shouldn't.
Besides the safety lever mod I did to mine - that makes the manual of arms much easier to manipulate the safety with your index & middle finger without your hand leaveing the grip.
There are several other other things that I did to my rifle that have been beneficial.
The two stage trigger was terrible - all I did was pull the FCG out, grind off & polish the raised back edge of the hammer ear where the trigger hook disengage's. The trigger pull is much better now.
The muzzle brake was loose, and needed to screw in another quarter or so turn, to be tight against the front sight base and engage the detent pin. All I did was file and polish the base of the brake to make fit like it should.
Evedently, my front sight base had a little cant.
After having to push the front sight over more than I liked when zeroing, I wasen't satisfied with it not being centered between the protective ears... so I used a rubber mallet to move the FSB.
With several hard strikes to the FSB, - while at the range & shooting in between (adjustments) to check for progress, my sight post is now perfectly centered.
IMO, Just because it came from the factory the way it is, doesn't mean that's the way it's ment to be, and nothing should be done about it.