I had high expectations for this. However, first stumbling block was the necessity to remove my scope to put it on the rail. After installation, I noted the weak failure point as the end with the square hole for the 2nd piece. Sure enough, within 10 minutes, that short end snapped off (more how the 3d printing is parallel to the failure point). Wasn't able to use it in the field. Again, I like the concept; it was the details that disappointed me.