Finished painting my "SPR" and LWRC M4...
The "SPR" is a G&G Cansoft, with.... parts bought so long ago I can't remember who made 'em, except most came from eHobbyAsia. It's almost all external; the only internal upgrades are a 120 sring and sorbo pad.
The M4 is a CA EBB, stock internal, and recently changed over the fake Eotech for a fake ACOG (G&P, maybe?).