Here is a BAD ADVICE.
I dont know how many rounds you guys have put through yours,
But I have two sets. Factory on my SW1911's. (photo's in the 1911 pic thread.)
The first set stopped working after about a year. not the batteries.
Had to send them in for warranty. got them fixed and sent back, took about 4 month.
Bought a second SW1911PD with factory lasergrips. They also worked for about a year.
And now my first ones that were repaired, broke again after about 2 years.
I dont know if I was just unlucky. But now I have had 3 malfunctions with them.
I would not trust my life on these things ever.
on the plus side,
when they do work, they are fun to shoot with and quite accurate.
But now I have to send both sets in for repair again.
My .02$