Pros. 1 great workmanship, fit well smooth wont buy anything but this metal again. Fantastic. 2.shipping was onetime Cons. I purchased this item as advertised upgraded extended fireing pin and bolt carrier group for 7.62x39. Firing pin per caliper was much shorter than my Anderson arms in 7.62x39 and as such had failure after failure after failure to fire light pin strike. Swapped out the firing oin from other after measuring the length and no problems at all. I have not contacted customer service yet to resolve this issue so we will see how that experience will be but I will update this review accordingly. As long as this issue is fixed I would still purchase this item and shop from this store in the future. Update to come