I have been using a cheapo Harbor Freight Stapler as advised by several members of this forum. I have already put about 1k cheap staples from harbor freight through it. Worked like a charm. I went to shoot 1.5 inch grip tite staples this evening into nuc boxes, and after a while the gun started shooting the nails about 3/4 the way in, and then crumbling the top. That, a few good staples, and then a few miss fires. The first couple hundred shot just fine. Is this the gun or the staples? I have the psi on the compressor set at 100.