In advance thanks for the constructive input, we're talking ar pistols, likely in .223 of some flavor. I like shorter for maneuvering capabilities, but like ballistic performance of longer barrels..... That being said, do the -2.5" make up for enough maneuvering with suppressors attached to justify the bullet performance? Under 50 yds, likely under 30 yds, looking at controlled chaos, ttsx, gmx and other sturdier but expanding bullets for this one.