The greatest problem while firing the M24 with the M17-series protective mask was that of recoil breaking the seal of the mask. Also, due to filter elements and hard eye lenses, the sniper could not gain and maintain proper stock weld and eye relief. Additionally, the observer could not gain the required eye relief for observation through his M49 observation telescope. However, testing of the M25-series protective mask provided the following results:
a. Because of its separate filtering canister, the stock weld was gained and maintained with minimal effort.
b. Its flexible face shield allowed for excellent observation. This also allowed the sniper and observer to achieve proper eye relief, which was needed for observation with their respective telescopes.
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