For the Umarex HDB68, the 7 cm Z-RAM Buttstock Adapter is the explicitly supported current offer. The shorter 5.5 cm Z-RAM ASA To Chamber Adapter is a different product: its exact HDB68 fit remains unconfirmed here. The two should not be treated as interchangeable simply because both names refer to a rear adapter.
Identify the HDB-specific 7 cm adapter
The current HDB68 listing identifies a 7 cm burnished-steel adapter with an integrated O-ring and states that it fits HDB68 versions. Its supplied scope is one steel adapter.
The shorter ASA To Chamber Adapter is listed at 5.5 cm and names several other marker platforms. Its shorter dimensions identify a separate current product.
There is one important physical prerequisite on the HDB-specific product page: fitting it involves a cutout in the rear plastic cover. It should therefore not be mistaken for an external accessory that leaves that cover untouched.
A buttstock adapter is not the shoulder rest
The word “buttstock” can describe different items in the same parts range. The HDB adapter is the connection component. The separately offered Z-RAM Buttstock Black is an external shoulder rest specified for a 50 mm-diameter, 0.2 L bottle. Its package contains the rest and two screws; the pictured bottle is not included.
That rest is selected by the bottle’s actual outside diameter. For an existing matching bottle, its own dimensions and supplied parts are the relevant information; it is a separate shoulder-rest component rather than a marker-to-bottle adapter.
The useful distinction before choosing
Start with the exact object you need: the HDB-listed 7 cm adapter, the differently identified short ASA adapter, or a separate bottle shoulder rest. The first has an explicit HDB application in the current listing; the short version needs specific fit confirmation. Keeping the product identity and physical role separate gives you a clearer choice.
The HDB adapter and a separate shoulder-rest component
BUTTSTOCK ADAPTER HDB68 UMAREX T4E Serie
The 7 cm burnished-steel adapter explicitly listed for Umarex HDB68, with an integrated O-ring. One adapter only; the listing includes a rear-cover alteration prerequisite.
View HDB68 adapter
Z-RAM Buttstock Black 50mm diameter for 0.2L bottle
A separate external rest for a 50 mm-diameter, 0.2 L bottle, supplied with two screws. No bottle included; not a marker-to-bottle gas adapter.
View 50 mm shoulder restThe separate 50 mm bottle shoulder rest
This short introduction focuses on the separate Z-RAM shoulder rest for 0.2 L bottles and its styling. It complements the shoulder-rest option above; the HDB68 adapter is a different component.
▶ Play on YouTube🚀💥 Ultimate HPA Shoulder Stock – Z-RAM 50mm Buttstock for 0.2L Bottles for FSC HDR68 HDR50 HDP50😎
Channel: Z-RAM
General Z-RAM viewing: product categories
This separate short introduces the shop’s parts and ammunition categories. It is broad browsing context, not an HDB adapter installation or fit test.
▶ Play on YouTubeThe Ultimate Shop for RAM Tuning Parts: Ammo, Valves, Chambers, and More HDR50 TR68 FSC TCP
Channel: Z-RAM
Important Legal Notice
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