The M33 handguard provides 2 mounting rails, complete with thermal rubber rail covers and heat shields. No tools or gunsmithing required for installation. M44L 4 sided rail system includes 2 vented and 2 non vented rail covers. No gunsmithing required, handguards mounts just like factory handguards. M44S 4 sided rail system fits carbine type rifles and includes thermal rail covers.
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