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LPK vendors?
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Although RTB is $3 cheaper on the LPK, KTM has a lot of really cheap parts you can add on, like a 10 pack of gas rings for $5.
Another 2 great site to look at for larger purchases is battlehawkarmory and lanbosarmory. They don't always have the cheapest price on smaller items but when looking for uppers, lowers, LAMs, optics, lights, etc.. I've personally saved hundreds over the years with them.
I had never heard of either of the other two but ill make sure to check them out thanks for the heads up!