The only problem with using these setscrew holes is many times the bottom of the setscrew becomes soldered in the process. Many rifles have a small setscrew in the rear sight base used only to hold the base in position while its soldered to the barrel. I can give several examples as I've studied very long on this particular deviant behavior. Having said that, I'm aware that in many cases a single drilled/tapped hole can be camouflaged or hidden. One or two tapped holes would solve most of the world's problems but I'm bound by my design criteria and it can be very challenging to do that without those tapped holes. I'm working from the perspective of a collector of vintage military rifles that cannot be altered lest their value & collectability be destroyed. I'm working from the religious perspective of ~no modifications allowed~. Its real accurate with Norma factory 7.7x58 except the chamber is so oversize it swells the brass almost to the point that I can't size it so I relegated this rifle to mediocre cast bullet loads. Its pretty dang accurate with 311299 and 12 grs Unique. I'm not sure this same base clamp will work for the Type 99. The Type 99 Arisaka has a rear sight base that mimics the Type 38 EXCEPT that dang radius isn't as pronounced. I want to try the Lee 170 gr *cruise missile*. 266" 140 gr cast bullets side-ways at 50 yds.
#TYPE 99 ARISAKA SCOPE MOUNT FREE#
The ladder pin holes allow a free fit for M3 screws so this Arisaka mount may end up being one of the more stable of the mounts I'm planning. Those will be afixed (somehow) as clamps around the sight base.
I've machined two pieces of 1/4" steel in half. You see that radius and ledge along the side of the rear sight base? A nearly perfect 1/8" radius which means a 1/4" round fits it really nicely. Sometimes I have to leave it alone for days/weeks while I try and figure a way to solve a problem. I think I'm going to impress myself with this 6.5 Arisaka. I'm only doing mounts for rifles/carbines I have. It was made in 1892 and is very nice with fiddleback walnut. My 91 Argentine will put 7 of 10 311299 into one hole at 50 yds. They are very similar to this Type 38 rear sight base. The next rifle I'll work on is the 1895 Chilean Mauser and by proxy, the 1891 Argentine Mauser as they have the same rear sight base. The 1908 Brazilian Mauser mount is representative of the most common type of rear sight base found on 98 Mausers, though they're not all dimensionally identical. I haven't done the anchor on this yet.Īll the mounts that I'll be fabricating are works-in-progress. Its flat bottomed and cost less than $10. The rail is purchased, in this case NcStar mil-std-1913 mount for the Marlin 336. For the time being I'll continue with this one. I started this one last night and can already see a brilliant method of anchoring it. The Japanese Type 38 rifle represents a more challenging platform for mounting a long eye relief scope mount.
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