Ok, so I bought this Spikes Tactical ST-22 complete .22 caliber upper. This is the complete M4 style upper with proper .22 cailber 1:16 twist barrel, and normal 1/2x28 threaded end. Again this is not the "COVERSION". The barrel has the M4 profile, and actually sits inside the upper reciever 1.5" making the barrel appear to be 14.5" instead of the 16" it actually is. I bought this thinking it would be great practice and cheap. Well it is, except my 9mm AR is just about as cheap when I reload my own ammo. I have approximatley 750 rounds of Federal Bulk Pack (blue box) through it. So with that said, I am looking to sell the upper alone for $525 (includes 2 mags) plus shipping if someone out of local area wants it. If Local, I can probably deliver to greater Northern Seattle area (I am in Bellingham) Complete Upper(2 mags): $525 Not looking for any trades right now. Here is a quick photo of it with the M4 handguards.