If you have a forward assist installed on your rifle, print the forward assist version. Otherwise, the standard lowers will be stronger (since lowering the shelf increases stress concentration in the lower).įor all the high and low-shelf variants, there are two sub-variants – lowers that have a cutout for the forward assist, and lowers that do not. If you plan on using an FRT trigger, or another device that requires a low-shelf receiver, print one of the low-shelf models. There are eight UBAR2 variants are available for download.įour of the variants are the UBAR2, four are the UBAR2C – the “C” designation indicates that the lower has a little extra clearance.īoth the UBAR2 and UBAR2C have four sub-variants – there are high-shelf options and low-shelf options. UBAR AR15 Lower Release Announcement UBAR2 AR15 Tech Specs
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