I have a LH stag AR and recently purchased a 13" Troy alpha rail for it. I changed out the gas block for a low profile one and removed the delta ring and spring. When I go to slide the Troy Alpha rail on I run into a problem. The dust cover pin gets in the way of the little piece on the end of the backside of the rail. The LH Stag has a dust cover which flips up and has the dust cover rod on the top of it. Is there anyway around this to make it work ?