I should stress that I DIDN\'T buy this from Z1.
This gun is utterly useless!! Shot-to-shot FPS appalling due to having to load each shell individually with CO2 (Using supplied adaptor) i was getting up to a 50fps variance - not what you want from a Sniper\'s Rifle. As you are loading unregulated CO2 into the shells, you never quite know when the 12g bulb you are using is running low so you may well load some shells half-full with CO2. I found that 2 mags (10rds) is about all you could get and keep some form of consistency.
No Hop Unit so BB\'s (of any weight) drop to the floor after 15M although accuracy out to 10M is perfect due to well spaced factory TBB.
As far as I have been able to find; the barrel, trigger, stock, magazine, shells. feed ramp are ALL proprietary to the APS and cannot be swapped out.
For showing off to you mates this is epic - for it\'s intended purpose, less so. Buy a stocker TM VSR for the same money and own the opposition