I replaced the foregrips on a Marushin MP40 with a set from History Arms in the US. The screw holes were only slightly out, running a drill through them in situ sorted the problem out easily. Apart from that minor problem, their products are excellent.
My MGC68 MP40 stil has its original forgrips fitted.
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.