Here is a pic. I just put it on a few weeks ago. I had the COLT 4 position prior to it. I really like the ACE SOCOM M4 stock. It is very solid, and also has the sling attachment incorporated. It extends further (not very much, sorry no numbers yet) than the prior colt stock, but it does not retract as short as the colt did, by about 1/2-1" approx. The push button for extend/retract is the same allen nut which is also adjustable. Basically, I can torque it so I can't extend/retract it (absolutely no play), or I can loosen it so the amount of pressure to push and retract/extend is very loose. The biggest thing I noticed is there is absolutely no play, opposed to the little play w/ the Colt. Also, I notice the very slight play between the upper and lower seems more evident now, since everything aft is rock solid and tight. I am not the resident expert w/ this, just my .02
[img]http://www.imagestation.com/picture/sraid81/p50346002501ee4f530755b2f13322952/fafb10ce.jpg[/img]
[img]http://www.imagestation.com/picture/sraid81/pef18644dc65c1b34247010af8f2f4449/fafb11b9.jpg[/img]
[img]http://www.imagestation.com/picture/sraid81/p372a4f10aebb2dc27ba2565bbe5092e6/fafb1203.jpg[/img]
...and one other thing to add, don't go w/ the 1" rubber butt pad, 1/2" is what I'm changing to, heck, you really don't even need one.