Metal hand guard compatibility

Hey guys just grabbed a cqb slr and was wondering which handguards are compatible, was looking at this one from monkeemods :

Also whats the size of the stock nylon guard on the cqb?

Cheers

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Hey mate

Did you end up finding a solution? I’m thinking about the same thing

Most if all fit, excluding those that are designated for hk416 usually it states in descriptions but most handguards seem to be ok