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All Springer/NP/PCP Air Gun Discussion General > PCP/CO2/HPA Air Gun Gates "The Darkside"

2260MB Tubes with Ground Finish - DO NOT USE FOR HPA

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Magnum Airpower:
 Bob, didn't realize that photo had the misreading on the micrometer until you pointed it out. I was on vacation when I posted those and was kind of rushed to get them up. The wife wasn't too happy I was "working" instead of paying attention to her. It's hard to work under threat of bodily injury! LOL! Deleted that photo, wall thickness and difference in OD explained below.

 UPDATE: TOOK A CROSS-SECTION PHOTO OF THOSE TUBES SIDE BY SIDE. THE TUBE ON THE LEFT IS FULL-THICKNESS, THE ONE ON THE RIGHT IS GROUND. WHEN I MEASURED THE WALL THICKNESS FROM THE OD TO THE BOTTOM OF THE THREADS, IN OTHER WORDS THE ACTUAL WALL THICKNESS AROUND THE THREADS, IT'S .009" THINNER ON THE GROUND TUBE WHICH IS CONSISTENT WITH THE OD BEING SMALLER BY .017" - .022" DEPENDING ON WHERE YOU MEASURE. YOU CAN ALSO SEE THE DIFFERENCE IN OD DRAMATICALLY WITH THE TOPS OF THE TUBES ALIGNED, THE BOTTOMS ARE NOWHERE NEAR EACH OTHER.

Bill

Salvor6:
I just finished converting my 2240 to HPA. I used seamless stainless tubing to make the main tube. It is .875 O.D., .745 I.D. with a .065 wall. The tube is also longer at 10". I pumped it up to 3,000 psi with no problem. Got a whopping 993.4 fps with JSB 14 grain pellets!

Salvor6:
Here is a pic of the chrony. I couldn't put both pics in the same post.

Hoosier Daddy:
Show Off!
 ;)

rsterne:
Could we please keep this thread on topic, regarding the safety of the 2260MB tubes with the thinner wall and ground finish.... Please start your own thread to brag about results (nice job, BTW)….  ;)

Bob

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