Remove both front and rear pins and drop the trigger assy. from the receiver with the bolt in the forward position.
Look at the inside of the trigger assy. You will see a bushing for each pin front and rear. There will also be a detent spring on each bushing. This spring is shaped like the letter "D". That detent spring is prolly' not on the rear bushing.
Brownells sells them, and they are very simple to install.
