There was UTI-4 type 15B with M-25V and PBP-1A, armed with two BS. It was produced at the end of 1941 in Baku.IMHO , although the UTI-4 based on the I-16 type 5 it is not the UTI-4 but just the I-16 type 5 powered the engine M-25 or M-25A. The traces of the OP-1 collimator installation can be noticed on the I-16 fixed late cockpit windshield that was different from the one used for UTI-4 . The landing gear possible fixed or just lacking the covers. I can't see well the bottom part of the front engine cowling. But it looks like there wasn't the T shape airinlet into the oil radiator used with the very late I-16 type 5 powered by the M-25V engine. Actually, the very late kites had the PAK-1 reflective gunsight instead of the OP-1 one. But the main detail that allows me to believe that's the I-16 but not the UTI version is that the UTI-4 was unarmed aircraft basicly while the one has the armament dismounted with the hosting compartments at the wing leading edges left open.