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- This is a quick video of my new
- Fostech Echo AR-II Mag dump
- 11.5 inch SBR, extra heavy barrel, Surefire rails,
- 300 Blackout PMAG40
- First
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First time using the Fostech Echo trigger Mag Dump Big Jake mag dump Fostech echo trigger.
Shooting various AR15 uppers (7.5" 5.56mm, 8" 300 Blackout, 16" 300 Blackout) on a registered SBR lower with the
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