Tuning Umarex M1A1 Thompson Repair
- By borne2fly
- Traditional Airguns
- 182 Replies
Glad to hear I could help
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The donut … I wouldn’t give up on it just yet. If it registers off the smaller tube then then, yes, it could fall out of place if the smaller tube completely retracts. But what if it registers off the bigger tube? To do that, the donut would need to extend back over the larger tube for as far as possible … essentially a sleeve with a step to a smaller diameter at one end.
Just thinking out loud.

The donut … I wouldn’t give up on it just yet. If it registers off the smaller tube then then, yes, it could fall out of place if the smaller tube completely retracts. But what if it registers off the bigger tube? To do that, the donut would need to extend back over the larger tube for as far as possible … essentially a sleeve with a step to a smaller diameter at one end.
Just thinking out loud.
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