Red Ion Pro
SP rail w/ on/off
PE 68 4500
ER 20/20 Echo
Last alot longer than the stock detents
Two spring strengths
Good anti-double feed
Need to be lubed
Light springs may not work (see review)
They weren't too hard to install. All yo need to do is take out the stock ones, lube these ones a little, put the springs on, and stick the sticker things over the hole that you put them in. I chose the light springs since I have an egg, but if you have a halo, or vlocity, or pulse, you should probably use the stiff springs.
They seem to do their job well. I did have alittle problem where one of the detents started sticking and lube wouldnt do the job. All I did was put in one of the stiff springs and that fixed it. Overall, I havn't had any double feeding isues or anything.
Pretty good detents, don't really have to worry about double feeding. I give it a 9.4 (9 rounded down) because nothing is perfect and the sticking issue.