Does anyone have experience or information on dpms ar-15 rifles. I had a colt 16"carbine, but sold it last year when i was hurting for money. Local gunshop has a slightly used dpms m4 w/collapsibe stock, compensator, 16"brl, removable handle, 2 30rd mags, hard case. He wants $900 for all of it, but this seems a little steep. My cousin actually traded the gun in on a ruger varmint .22-250 and i know the ar was barely used. It seems to be very well put together, doesn't have the springy colt charging handle sound, which is one of the reasons i wasnt wild about the colt. i have heard mixed reviews of dpms, but most have been good. Any opinions?

Thanks