Ar front sight base - Kexuan AR-15 A2 Front Sight Post Gas Block w/Bayonet Lug

I’ve purchased three of these and the bases are good. There’s just two little problems. The last one I got instead of having the proper taper pins to lock it down was sent with doll pins that I believe are 3 mm. The second problem is the threads for the front site. The threads on the front side that come with it or 832 and when you purchase sites from other places the threads are 838 which means they don’t fit unless you re-tap the hole but otherwise they’re a good value for the money.