Minute Man Machining
Minute Man Machining The Twitch (MPA)
The best-built version of the open-source Twitch design: 4140 pre-hardened steel, caliber-specific, one week out.
Quick Specs
- Price
- $120
- Weight
- 1 oz
- Brand
- Minute Man Machining
- Category
- trigger
Features
- •4140 pre-hardened steel
- •Three size options for MPA 9mm, 5.7, and .45 ACP
- •SKU MPA-T
- •Roughly one week lead time
- •$120
Capability Boosts
Recommended For
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Compatibility Tags
Overview
The Twitch started as an open-source forced reset design released by ToadLicker556 for the MPA Defender, and three vendors now sell versions of it. Minute Man Machining's is the best-executed: 4140 pre-hardened steel, cut in three sizes for MPA 9mm, 5.7, and .45 ACP hosts, and quoted at roughly a week from order. It is the only Twitch variant offered in a .45 size, and at $120 it is cheaper than FTA's $189.99 steel version of the same design.
Caliber-specific sizing matters here. The Twitch geometry interacts with the bolt, and MPA bolts differ across 9mm, 5.7, and .45. A vendor that cuts three sizes is engaging with that; one that sells a single part is asking your gun to accommodate it.
The important caveat is not Minute Man's build quality, it is the design's provenance. The original Twitch beta release warned that testing produced out-of-battery detonations, with heavy lubrication appearing to reduce the problem in limited testing. Minute Man's page does not repeat that warning, but it is the same design lineage. Function check carefully, lubricate generously, and have a gunsmith look at the gun before you shoot it.
Key Features
- 4140 pre-hardened steel construction
- Three size options matched to MPA 9mm, 5.7, and .45 ACP bolts
- Only Twitch variant available in a .45 ACP size
- Roughly one week lead time from order
- SKU MPA-T
- One round per trigger function; semi-automatic operation retained
Pros
- +Steel Twitch at $120, well under FTA's $189.99 version of the same design
- +Caliber-specific sizing across 9mm, 5.7, and .45 ACP
- +About a week out, versus 4 to 8 weeks for the A.R.T. system
- +4140 pre-hardened steel solves the printed Twitch's short service life
Cons
- −The Twitch design's original beta release warned of out-of-battery detonations during testing
- −Vendor states some fitment may be required
- −No published warranty on the part
Detailed Specifications
- Material
- 4140 pre-hardened steel
- function
- Forced reset trigger, one round per trigger function
- compatibility
- MPA Defender in 9mm, 5.7, and .45 ACP (select the matching size)
- install
- Some fitment may be required
- leadTime
- Approximately one week from order
- sku
- MPA-T
- designOrigin
- Based on the open-source Twitch design by ToadLicker556
- safetyNote
- The original Twitch beta release reported out-of-battery detonations during development; heavy lubrication reportedly reduced the issue. Have a gunsmith inspect the firearm before live fire
- legalStatus
- Verify current federal, state, and local forced reset trigger legality before ordering
- manufacturer
- Minute Man Machining
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