Better than the plastic cover that comes with the Fastfire III. The BF-3 cover makes the Burris Fastfire 3 into the 5 star product it should have been from the factory. I love this cover! Perfect fit. Also, it comes at a very fair price. Easy to put on and remove, with a pull-tab for fast removal. Dream Plastics Burris FastFire III Cover (2-Pack) - Green 4.7 out of 5 stars 24. $9.95. $9.95. Compared to the plastic one that came with the FastFire III, this one is lighter (0.2 oz), less bulky, and won't crack like the plastic cover that comes with the FF III. You will not be disappointed. It appears to be just thick enough to offer pretty good shock protection without increasing the bulk of a sight that was chosen for it’s compact size. Dream Plastics Scope Cover for HoloSun 507c HS Red Dot (2 Pack) 4.8 out of 5 stars 38.