My opinion is this is a sniper forum, not a gunner/grenadier forum. This AEG section is strictly for long range, DMR/Semi-auto sniper setups.
Also, had you truly been researching this topic for several months, I should hope you'd know what internals are or are not compatible with each of your choices.
Also, had you truly been researching this topic for several months, I should hope you'd know what internals are or are not compatible with each of your choices.