A US M4 sight may be fitted to the Japanese weapon by shimming the sight bracket slightly.
3.
The "'M37C "'was a variant without a sight bracket designed for use in aircraft armament ( like the skid-mounted XM1 / E1 helicopter armament subsystem ).
4.
The "'" A180 Laser Lock " "'sniper rifle ( from Series 2, Episode 1; " Hunter / Hunted " ) was an AR-10 with a sight bracket on the carrying handle and a large laser projector under the barrel.
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