A very good point was made here. I do not care if I only change the springs in a trigger I give the customer back what ever parts I have changed. I tell them that if they ever want to send the gun into the factory stop by and I will replace the after market parts with the origional parts. When you send the rifle in it will come back " Stock" and you may not get back your after market parts so be warned. After all you do not want to loose a $70 dollar trigger!!!