Some of those clone rifles, if you take them from the stock, right on the flat portion of the receiver bottom behind the recoil lug.
The investment casting process leaves a wedge shaped depression that goes right to the bottom of the lower bolt lug. Some do not like that because of possible weakening over original design intent.
Also, as far as quality goes, it seems as if the bottom of the trigger has been ground for additional clearance on the inside radius of the trigger bow. Their should be a little more clearance found there than what can be seen from the ad on GB.