I know im a PMR guy but just thought i could mention this. PMR's are ready out of the box no upgrades required at all all you need to go is a hopper and your off.PSST... get a pmr insted.
I got a great deal of this forum on a PMR
PMR
14" UL Barrel
UL Trigger
for £200
So have a look around. Just achnowledge the posts and make the right decision. Im not going to force you into a decision.
Hope this Helps
-Will