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Posted: 12/8/2020 10:37:12 AM EST
I've got a 300BLK that I've used for years with both supersonic and subsonic ammo.  It's starting to not cycle reliably with subsonics, and I'm wondering if the gas tube or block has developed significant fouling.  Is there any maintenance that can be done (other than blowing it out with a mag dump of high-pressure supers)?
Link Posted: 12/8/2020 10:45:04 AM EST
[Last Edit: 12/8/2020 10:46:01 AM EST by tweeter]
just use the supers, it can't hurt anything
Link Posted: 12/8/2020 10:58:46 AM EST
I had a buddy bring me his that would not cycle, I removed the tube and could not blow through it with my mouth so put the compressed air to it and a chunk of carbon (I assume) shot out like a bullet. Only one time I have ran into this but it can happen.
Link Posted: 12/8/2020 11:13:45 AM EST
I spray the tube out every so often with carb cleaner.
Link Posted: 12/8/2020 7:27:05 PM EST
[Last Edit: 12/8/2020 7:27:36 PM EST by ColtRifle]
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By SScot:
I had a buddy bring me his that would not cycle, I removed the tube and could not blow through it with my mouth so put the compressed air to it and a chunk of carbon (I assume) shot out like a bullet. Only one time I have ran into this but it can happen.
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I’ve had a partially blocked gas tube before. That’s why I keep spare gas tubes on hand. Likely faster to just replace it.
Link Posted: 12/8/2020 10:17:05 PM EST
While at the range, Spray some carb cleaner down the tube and then work a section of wire down the tube, trying your best to scrape out the inside.

Load up a mag full of super sonic ammo and blast.

If none of that works, replacing the tube is probably the best bet.

Link Posted: 12/8/2020 10:21:42 PM EST
Given the current cost and availability of ammo, od just replace the gas tube.
Link Posted: 12/9/2020 9:25:05 AM EST
[Last Edit: 12/9/2020 9:25:32 AM EST by Rincoln]
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Originally Posted By MJ11B4P:
Given the current cost and availability of ammo, od just replace the gas tube.
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That is why I didn't just do the mag dump.  I know it would likely blow anything out. But, if there was a "cheaper" alternative, I wanted to go that route.
Link Posted: 12/9/2020 9:31:49 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Taskmaster86:
While at the range, Spray some carb cleaner down the tube and then work a section of wire down the tube, trying your best to scrape out the inside.

Load up a mag full of super sonic ammo and blast.

If none of that works, replacing the tube is probably the best bet.

View Quote


This sounds like a great way to clean out the tube.  I may have to give it a shot
Link Posted: 12/19/2020 11:43:41 PM EST
[Last Edit: 12/19/2020 11:45:26 PM EST by Exorpmtech]
Tube are like $10.  If you're trying to clean it you might as well remove the tube and replace it at that point.
Link Posted: 12/19/2020 11:44:48 PM EST
[Last Edit: 12/19/2020 11:45:00 PM EST by Exorpmtech]
double tap.
Link Posted: 12/20/2020 2:40:36 PM EST
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