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5/1/2014 2:07:38 PM EDT
Anyone ever have problems with another upper not fitting on a RRA lower? I have a SOTA 300 Blackout & the back pin in the lower doesn't seem to want to fit. Any Ideas?
5/1/2014 3:14:10 PM EDT
[#1]
Nevermind.. had to use a rubber mallet to get it to engage. Just an extra tight fit. No wiggle in that lower. lol
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