THE ARMS #40 VARIATION YOU REFER TO IS THE:

#40 STD. A2

WE STOCK IT.

THE REGULAR ARMS #40 WILL FIT UNDER THE TA31 IN AN ARMS #19-ACOG MOUNT. I SUSPECT THAT THE STD. A2 VERSION MAY NOT. I HAVEN'T TRIED IT, MYSELF, AND DO NOT PRESENTLY HAVE SUCH A SCOPE IN SUCH A MOUNT TO CHECK IT OUT.

IF SOMEONE OUT THERE WITH A TA01/TA31 IN AN ARMS #19-ACOG MOUNT CAN MEASURE THE CLEARANCE BETWEEN THE SCOPE AND A STOWED #40, I'LL MEASURE THE DIFFERENCE IN HEIGHT STOWED OF THE #40 AND #40 STD. A2. THEN WE'LL BE ABLE TO ANSWER THIS.

WES GRANT
MSTN.BIZ

I MEASURED THE TWO STYLES. THE #40 STD. A2 IS 0.104" TALLER THAN THE #40 WITH THE CHOPPED OFF APERTURE.

SO, BASED ON THE ABOVE MEASUREMENTS OF SLIGHTLY LESS THAN 0.1", THE #40 STD. A2 IS A "NO GO" UNDER THE TA31 IN AN ARMS #19-ACOG MOUNT.

BUT, FROM MY POINT OF VIEW, WHO REALLY CARES? WITH A BUIS, THE BIG APERTURE IS WHAT YOU'RE GOING TO WANT FOR IN CLOSE WORK. GO WITH THE REGULAR #40.

OR, CONSIDER ANOTHER BUIS, LIKE THE KNIGHT'S 600-METER OR EITHER THE GG&G MAD OR A2. THEY'LL ALL FIT UNDER THE SCOPE WITH ROOM TO SPARE.

WES GRANT
MSTN.BIZ

ARMS STILL OFFERS THE ORIGINAL #40 WITH THE TOP OF THE SMALL APERTURE WHACKED OFF. AND IT WORKS WITH THE #19-ACOG. BUT NOT WITH THE TRIJICON TA01NSN STOCK TA51 MOUNT.

WES GRANT
MSTN.BIZ