Riot Helmet Gas Mask compatibility

Testing the compatibility of some gas masks/respirators with both a riot helmet and a military helmet.
While images of police wearing respirators under riot helmets is a common one, not many gas masks actually fit under riot helmets properly, in this video I test an Israeli 4a1 respirator, a Soviet GP-5 respirator and a British S10 respirator to see how well they work with either helmet.