Huben GK1 and GK1 Mini spare parts catalogue

Choose a part group, or use the exploded diagrams to find exactly where a part sits; clicking a number on a diagram takes you to that part's page.

96-part catalogue

6Barrel and moderatorBarrel, shroud, moderator baffles, rail frame and fixing screws.9Air tube and fillingTitanium tube, regulated tube, fill cap, check valve and pressure gauge.26Magazine and feedRotary magazine, magazine base, indexing and release mechanism.5ReceiverReceiver block, back cover and the parts that join the receiver to the stock.17Firing and valvesStriker, opening and closing valves, brass valve housing and seals.22Trigger and safetyTrigger, trigger arm, sear mechanism and safety lever.1Power adjustmentPower wheel under the stock and the adjustment stem.2GripPistol grip and its screw.8SightsRear sight, rear sight base, adjustment screws and front sight fibre.

Exploded diagrams

GK1 and GK1 Mini, all parts

Diagram 1

All parts

No.	Part	Size	Group
1	Receiver House / Receiver House - Low Power		Receiver
2	Metal Seal of Opening Valve		Firing and valves
3	Plastic Seal of Opening Valve		Firing and valves
4	Opening Valve O-Ring	11.6x1.8 NBR90	Firing and valves
5	Opening Valve		Firing and valves
6	Striker		Firing and valves
7	Striker Buffer		Firing and valves
8	Striker Spring	6.8x38x1.1	Firing and valves
9	Striker Spring Guide Rod		Firing and valves
10	Receiver Back Cover Plate		Receiver
11	Receiver Back Cover Plate Allen Screw	M5x14	Receiver
12	Rear Sight Base Height Adjust Screw	M3x6	Sights
13	Rear Sight Base Pin	Ø1x15	Sights
14	Rear Sight Base Adjust Screw		Sights
15	Rear Sight Base		Sights
16	Rear Sight Adjust Spring	4.3x8x0.5	Sights
17	Rear Sight Base Spring	4x4x0.5	Sights
18	Rear Sight		Sights
19	Close Valve Spring		Firing and valves
20	Plastic Close Valve		Firing and valves
21	Plastic Close Valve Gasket		Firing and valves
22	Close Valve Spring Stem		Firing and valves
23	Close Valve Dynamic Wheel Adjust Spring		Firing and valves
24	Close Valve Housing Internal to Stem Seal		Firing and valves
25	Close Valve Housing Internal O-Ring & Fill Stop O-Ring	6.4x1.2 NBR90	Firing and valves
26	Close Valve Housing O-Ring	17x1.5 NBR90	Firing and valves
27	Close Valve Housing		Firing and valves
28	Striker Sear		Trigger and safety
29	Striker Sear Catch Pin	Ø3.5x16	Trigger and safety
30	Sear Spring	5.3x13x0.5	Trigger and safety
31	Sear Catch		Trigger and safety
32	Trigger Arm Pin	Ø3x17	Trigger and safety
33	Trigger Arm		Trigger and safety
34	Sear Catch Arm		Trigger and safety
35	Black Plastic Receiver Pin Cover	3.5x5.6	Trigger and safety
36	Black Plastic Receiver Pin Cover	3x4.6	Trigger and safety
37	Trigger Tension Fine Adjust Spring	2.5x11x0.5	Trigger and safety
38	Trigger Tension Fine Adjust Spring Base	M5x10	Trigger and safety
39	Safety Lever		Trigger and safety
40	Safety Lever Detent Ball 3mm	3 mm	Trigger and safety
41	Safety Lever Detent Ball Spring	3x5.5x0.6	Trigger and safety
42	Safety Lever Adjust Tension Allen Set Screw	M4x6	Trigger and safety
43	Pressure Gauge O-Ring	4x1.5 NBR90	Air tube and filling
44	Pressure Gauge		Air tube and filling
45	Housing for Magazine Indexing Arm (.177 & .22 & .25 / .30)	one for .177, .22 and .25; another for .30	Magazine and feed
46	Magazine Indexing Spring		Magazine and feed
47	Magazine Indexing Arm (.177 & .22 & .25 / .30)	one for .177, .22 and .25; another for .30	Magazine and feed
48	Magazine Release Arm Tension Spring	2.9x30x0.6	Magazine and feed
49	Magazine Release Pusher		Magazine and feed
50	Magazine Release Assembly		Magazine and feed
51	Magazine Release Assembly Allen Screw	M3x8	Magazine and feed
52	Screw on Top of Receiver	M3.5x8	Receiver
53	Air Mag Index Assist Pin O-Ring	4.5x1.2 NBR90	Magazine and feed
54	Air Mag Index Assist Pin	Ø2.5x11	Magazine and feed
55	Brass Insert Screw O-Ring	4.5x1 NBR80	Magazine and feed
56	Brass Insert Screw for Air Assist Magazine		Magazine and feed
57	Magazine Plastic Side Cover		Magazine and feed
58	Magazine Plastic Side Cover Allen Screw	M3x6	Magazine and feed
59	Breech Seal O-Ring & Pressure Tube Connector O-Ring	11x1.5 NBR90	Magazine and feed
60	Plastic Breech to Magazine Seal		Magazine and feed
61	Magazine	.177 and .22: 19 shots, .25: 17 shots, .30: 14 shots	Magazine and feed
62	Bearing of Magazine		Magazine and feed
63	Magazine Front Cover		Magazine and feed
64	Magazine Stop Guide Spring Pin	.177, .22, .25: Ø1.5x15; .30: Ø1.5x21	Magazine and feed
65	Magazine Stop Retaining Pin	.177, .22, .25: Ø2x10; .30: Ø1.5x10	Magazine and feed
66	Magazine Stop Guide Spring (.177 & .22 & .25 / .30)	one for .177, .22 and .25; another for .30	Magazine and feed
67	Magazine Stop (.177 & .22 & .25 / .30)	one for .177, .22 and .25; another for .30	Magazine and feed
68	Magazine Stop Guide (.177 & .22 & .25 & .30)	Same for all calibres	Magazine and feed
69	Magazine Base (.177 & .22 & .25 / .30)	one for .177, .22 and .25; another for .30	Magazine and feed
70	Magazine & Barrel Housing Bases to Receiver Fasten Screw	M4x12	Magazine and feed
71	Barrel Housing Base		Barrel and moderator
72	Barrel Shroud Retaining Pin	Ø2x8	Barrel and moderator
73	Magazine Base and Barrel Housing Base Fasten Screw	M3x14	Magazine and feed
74	Barrel Housing to Receiver Allen Screw (.177 & .22 & .25 / .30)	M3x35; one for .177, .22 and .25, another for .30	Receiver
75	Barrel Retain Nut	M12x1	Barrel and moderator
76	GK1 Barrel / GK1 Mini Barrel (.177 & .22 & .25 & .30)	.177, .22, .25, .30	Barrel and moderator
77	GK1 Barrel Shroud / GK1 Mini Barrel Shroud		Barrel and moderator
78	Front Sight Fiber		Sights
79	Barrel Shroud End Cap (.177 & .22 & .25 / .30)	one for .177, .22 and .25; another for .30	Barrel and moderator
80	Trigger Guard		Trigger and safety
81	Trigger		Trigger and safety
82	Trigger Retaining Pin	Ø2.5x12	Trigger and safety
83	Trigger Guard Locker		Trigger and safety
84	Dynamic Power Adjust Screw	M6x8	Power adjustment
85	Trigger Guard Locker Screw	M5x25	Trigger and safety
86	Trigger Arm		Trigger and safety
87	Trigger Arm Stepped Bolt		Trigger and safety
88	Walnut Grip		Grip
89	Grip Screw	M5x70	Grip
90	Pressure Tube Connector		Air tube and filling
91	Intake Valve		Air tube and filling
92	Intake Valve Cover O-Ring	9x1.2	Air tube and filling
93	Intake Valve Cover		Air tube and filling
94	Pressure Tube O-Ring	29x2 NBR90	Air tube and filling
95	GK1 Titanium Pressure Tube / GK1 Mini Titanium Pressure Tube		Air tube and filling
96	Pressure Tube End Cap		Air tube and filling