You're correct about the exports but wrong about imports capt14k. Do you have an (08) import FFL or are you an ITAR registrant with the State Department? I'd guess not?
27 CFR 447.41(c)(2) states: An import permit is not required for the importation of minor components and parts for Category I(a) and I(b) firearms except barrels, cylinders, receivers, (frames), or complete breech mechanisms, when the total value does not exceed $100 wholesale in any single transaction.