I have to agree with Unobtanium. I have not found a single good forearm replacement that works well -- and I had hoped to get lucky with a few purchases off eBay, but nothing worked out. Oh well.
Ultimately a solid clamp mount to the mag tube might be your best bet.
I believe the weight difference to be a major factor. The less weight, the less I need to carry around, the better.
...which reminds me I should probably get back to the gym
The reason I did not see one in the box, is that it came already in the tube! (Duh!)
I'm so used to having to assemble everything from screws on up that I assumed it was missing.
Thanks to the folks who responded..
Recently purchased a new M4. Stock right now, so use your imagination for the picture.
Anyway, I was assembling it (no problems with the bolt insertion, as some others seem to have had) but I'm curious if the tube should have a spring in it? I did not see one in the box..
Also, is there a FAQ for the M4 on this forum? I haven't broken it in yet, but want to make sure I clean it properly before I do (seems like CLP is the way to go).
Thanks in advance!