This is a standard Magpul MP5 handguard, modified by HKParts to fit the HK branded 22lr MP5. Solid, snug fit, with only a modest amount of force necessary to seat and install. This will not fit the MP5 22 SD models. Just the standard MP5 22 LR pistol and rifle models. https://hkparts.net/all-parts/magpul-hk-mp5-22lr-sl-hand-guard-black/
