Black "Goo"....

[MEHavey]

I happened to luck into a NIB 40 caliber Green Mountain barrel assembly set up as a
Thompson Center/Hawken drop-in replacement. For who might ask, I knocked the
wedge out of my 28" factory 45 Hawken; pulled the barrel; dropped in the new 32" 40 cal
Green Mountain; and reinserted the wedge. Perfect fit.

Then I set out to clean it using simple BreakFree as a first-cut solvent.

Out came the blackest "stuff" I have ever seen -- and out came more black stuff,
and out came More black stuff,... and out came More black stuff..... 45 minutes
later (including acetone to try and cut through whatever was in there), I was still getting
dirty patches out of that barrel.

I have no doubt at all that the bore has been superbly protected/preserved from the GM
factory... because absolutely nothing could have gotten through whatever they coated it with.

Anybody got any ideas what they might have used?

 

[Prairie Dawg]

Why not just call them & ask?
603-447-1095
--Dawg

 

[whughett]

Cosmoline..............

 

[BowerR64]

I just bought a new Pietta from cabelas and mine looks like it has been shot. Test fired

The barrel wasnt dirty out of the box but there are signs that there had atleast been caps fired. I had carbon around the hammer and frame around the hammer.

 

[Patocazador]

I just bought a new Pietta from cabelas and mine looks like it has been shot. Test fired

The barrel wasnt dirty out of the box but there are signs that there had atleast been caps fired. I had carbon around the hammer and frame around the hammer.

I wish all companies would test fire their guns if for no other reason than to see if the sights are correct (fixed sights). I have read of several people who had to replace their T/C sights because they were incorrect with short front sights.

 

[AbitNutz]

Super hot is what you need. Hottest water...or, if you can get the barrel out. Cook it in the oven a bit. Tilt the muzzle down in to a pan and out the goo will run. Cosmoline turns pretty viscvous when heated. I had to bake an old Russian Mosin for a bit to get it all clean.

 

[desidog]

32" = BIG oven.

What kind of oven would a 91/30 fit into? Mosin's aren't short either...

 

[[email protected]]

I have bought several GM barrels over the years and have never experenced
that.

 

[AbitNutz]

So the barrel stuck out the top a little...it still got a lot hot enough for the cosmoline to liquefy.

 

[MEHavey]

Black Goo -- Epilogue

Got it out to the range today.
Time enough for 4 trials of 2 each Ball Diameter/patch-thickness combo's using one
baseline powder (FFFgGoEX), one charge (50gr_Volume), and one Lube ratio of
7:1 H20/Napa Cutting oil (drawing from my 54 and 45 experience)

I got to the third trial series in the cycle and quit for the day...





postscript: Ran Brake Cleaner through before 1st fire -- still streaks on the patch
After firing, `ran (literally) soapy boiling water down the barrel (I put a 8" piece of Tygon
tubing over the nipple to drain the water/soap pastaway from the stock -- my old N-SSA days trick)
Then Witch's Milk (Moose Milk fortified w/ Simple Green) and processed the whole barrel again

.....still get streaks -- but who cares?



post postscript: Yes, it's finished/left inside and out w/ BreakFree/WeaponShield after all that.

post post postscript: It's got a smaller diameter patent breech. That gets treated with a standard slotted cleaning rod and a 3" cleaning patch tru' the slot/folded over the tip. THAT gets down into/cleans out the Patent breech chamber. Afterwards, clean the nipple chamber AND run pipecleaners through the flash channel and into the breech chamber. Not doing that part of the cleaning guarantees ohsomany people a 1st shot failure to-fire-every time. Because of this cleaning regimen, rarely-if-ever do I have to pull the barrel.

 

[[email protected]]

The 40's will shoot. That's what the wife uses in her rifle. A GM 40. She shoots
55 grs of Goex FF . She shot this last month at 50 yds.