My PTW upper came last Friday but I needed a few pieces to complete a M4 upper and they came today. 😉  Anyway here it is in all its glory!

Isn’t it cool?  I can swap the upper receiver between CQBR and M4 length in like 10 seconds!  I also got a red cylinder (it was cheap) but I’m afraid it shoots way too hot to use…  505 fps with the CQB barrel and 540 fps with the M4 length barrel.  Oh well in any case Colin is happy though I’m now considering changing the M4 upper receiver into a M16 length. 😀  We’ll see I guess.