Received my 1/16 M4 carbines from Live Resin today. LHS:

RHS:

These are right out of the bag with no clean up. The quality is perfect. I'm not sure about some of the configurations of the ancillary devices though.
The idea of this set appears to be 'easy assembly'. Noting that there simply isn't the market for 1/16, this set is a 'one stop' set, as opposed to the Live Resin pick'n'mix, choose-your-own-adventure sets in 1/35. As such, the range of ancillaries in 1/16 is limited to what's moulded here or by other vendors such as airborne miniatures.
Considering all of the above, I'm a bi disappointed that two of the three carbines have the same sight on them (not helped by my deep dissatisfaction with ACOG sights in general). Some variety would've been nice (Elcan SU230 SpectreDR or EOTech HHS 1?).
The second quibble is that one weapon's RAS has rail covers fitted to all four rails. If, in the unlikely event you find other ancillaries, the rail covers would make installing them difficult.
Noting all of the above, this set is still recommended.