This guide details the installation of a CSM Tri-Rail handguard onto a Umarex licensed HK MP5 .22LR. The process involves removing the faux suppressor and original handguard by unscrewing four bolts with a 5/64" Allen key, then sliding on the new handguard and reassembling the front sight and faux suppressor. A crucial step includes remembering to replace the small rubber washer on the barrel.
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