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I originally bought this Mag because the hex pattern on it match the hex fluting on my barrel. However it also helps that there aren't too many options when it comes to California and getting 10/30 mags. When I received the magazine I was surprised at how good the quality was. For a polymer magazine you can tell that it is solid and can take a good amount of abuse. I love the Orange empty indicator so you can easily distinguish an empty mag. It also fit perfectly right into my lower. Needless to say I will be ordering more, I only wish they made the same with a window on the side.
I will have to start out by saying I have not tried them out on the range yet, however the review will mostly be on the fit and the operation of the BUIS. I will try and update the review once I have used them on the range. Overall my initial impression of them is great. They installed right onto my AR-15 Upper and have 0 play (in fact they were almost difficult to push onto the rail). The rear sight looks to have an ambi windage adjustment but could not see anything for elevation adjustment. The spring loaded button for sight release is clean and has worked every time. Overall for the price I would definitely recommend.
Very happy with the fitting of the new Trinity Force Cobra, I have had the Trinity Force Alpha stock previously and loved it. The Cobra stock is essentially the same with the exception of the Cobra has a larger cheek rest area. For the price you can't go wrong with any Trinity Force Stock. The only gripe that I have is that there is a little bit of play with the buffer tube that is provided with the stock. Overall I am happy with the purchase.