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DPMS10/308
Built two EXACT identical weapons except one has a 16" barrel & the other has an 18" barrel. 16" version operates 100% like it should. Cycles just fine and stays open on last round. 18" refuses to cycle properly if at all. Swapped lowers, didn't help. Before the weapons were used/fired they were both disassembled, cleaned and the BCG's were oiled with Royal Purple Synthetic gun oil. Armorer set barrel nuts and checked headspace.
Scenario as follows....
Parts list in the file below.
Msg is sent to Superlative & Aero Precision.. questions or suggestions welcome.
Dan
Built two EXACT identical weapons except one has a 16" barrel & the other has an 18" barrel. 16" version operates 100% like it should. Cycles just fine and stays open on last round. 18" refuses to cycle properly if at all. Swapped lowers, didn't help. Before the weapons were used/fired they were both disassembled, cleaned and the BCG's were oiled with Royal Purple Synthetic gun oil. Armorer set barrel nuts and checked headspace.
Scenario as follows....
- Gas block full open or closed did nothing when firing @ the range. (30 rnds- Federal 168gr BTHP)
Moved to the shop for the following - Plugged the barrel from both ends, fed pressured air into gas tube (in the upper) & gas block let air escape when fully open and no air escape when fully closed.
- Pressurized air escapes barrel when fed through the gas tube in the upper.
- Gas block is tight.
- Loosened/slid adjustable gas block & tube down the barrel to check alignment.
- Gas dust marks on barrel indicates alignment with gas block.
- Gas port in barrel is clear.
- BCG holes are clear.
- Bolt gas rings are snug. (Gas powder on backside of bolt rings-none in front of rings)
- Swap BCG's
- Measure gas hole diameters in barrel & adjustable gas block.
- Contact Aero Precision & Superlative Arms for gas port hole diameters
Parts list in the file below.
Msg is sent to Superlative & Aero Precision.. questions or suggestions welcome.
Dan