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There is no reason... why a properly made and fitted spacer would result in an unsafe condition. Depending on how far over-clocked a barrel may be on initial fitting, it is more usual to peen or roll the shoulder of the barrel shank to produce a tighter fit. mhb - Mike

And no necktie... unless it's a bowtie, but, heck, who wears a tie in the shop these days? Glad you're not badly hurt. mhb - Mike

Most barrel makers... Have standardized 6-groove rifling for the .223/5.56mm, and the government still uses it, of course. There is no reliable evidence that the number of grooves (or geometry thereof) has any direct effect on accuracy. The reputation of the barrel maker and his products...

In the interest of perfect honesty... I've never actually seen the process, either. But I have read about steel making, and worked in barrel making with a metallurgical engineer - who explained the process to me. As I understand it, all commercial steels these days are cast in large billets...

You did not say ... whether this is a stainless barrel or not, but I'll assume it is, and that corrosion is not the cause. In which case, it is likely an inclusion in the steel itself. Such defects are not rare, but more often are found in the form of a 'pipe', or slag inclusion in the center...

The root of the problem... is most likely the overall round length. The rifle was designed to feed properly with the original 220 gr RN bullet, which results in a longer loaded round than with most modern bullets of lesser weight (and length), of whatever shape. I've never been able to get...

That was 'Woody' (Woodall ?) IIRC. He was the production manager at Lothar Walther USA, I believe. We had quite a lively series of exchanges about barrel making in general. He said, in so many words, that Walther was capable of making barrels to any specification whatever as to...

In firearms usages... it customarily means that the long axis of one device or barrel is aligned parallel to that of another: E.G.: co-axial machinegun in the tank turret; the MG barrel being aligned with that of the main gun. Telescopic sights are mechanically aligned co-axially with the...

It seems likely... that yours is an older 40-X, since the sear appears to be the split type originally used on the 721/722 series rifles (pre-700). If so, the 2 screws on the front control trigger pull weight and overtravel (top and bottom screws, respectively, in your photo, which has the...

Yes... another good classic is 'The American Rifle', by (then) Major Townsend Whelen, published by The Century Company in 1918 and again in 1923. mhb - Mike

But once again... that damned old charlatan did a great deal of damage to the gullible and easily misled who believed him. At least they did not follow him to meet the aliens behind the comet. He, however, should immediately report to, or be recalled by the home office. But that seldom...

Jackie: That's an interesting post-mortem. I'm happy to say I've never seen a barrel with as many 'features' in its interior geometry. My opinion is that, in the case of the barrel you dissected, the drill wasn't performing properly, because it wasn't correctly shaped, needed sharpening...

4Mesh: I don't know that anyone has measured and recorded the actual runouts in barrels they have observed to be 'crooked' or 'bent' as received from the maker. I certainly haven't. Neither do I know exactly how much displacement occurs due to dynamic imbalance of the blank in drilling it -...

Not all... The older-generation deep-hole drilling machines still in use by barrel makers, as opposed to more modern or altered machines, rotate only the barrel blank. At least we (those of us who still use antediluvian machinery) have progressed beyond hand-forging the barrel blank around a...

Shoot! Ah'm glad yuh smiled when yuh said that, pardner. mhb - Mike 'Not Quite the Last Hole Bender'

The problem... or at least ONE of them, in drilling a straight hole is that the barrel blank material (usually un-contoured bar stock) is not really straight to begin with, and/or not perfectly symmetrical. Then, when you drill the blank (perhaps 30" or more in length) at 3000RPM or more, its...

John & Alpacca: Thank you both very much! I hadn't looked at this thread in quite some time, and was pleasantly surprised to see it surface again. The process as described in the reference John provided would have to be classified as hammer forging - since it comes from a standard reference...

RCBS Case Lube 2... which, in addition to being an excellent lube, is the only water soluble case lube I know of. You can wipe the loaded rounds down with a damp rag, or simply wash them and rinse them in the sink - as I do. mhb - Mike

Fwiw... and speaking from experience (as a barrel maker): the real advantage in SS for accuracy applications is that the typical formulations (416R, etc.) are easier to machine than the common CM steels (4142, etc.), and interior dimensions and surface finish are usually a bit better, given...

If, as it appears from the images... the item is made of cast iron, it is almost certainly an 'alarm gun', intended to be used with a tripwire as an unmistakeable signal of an unauthorized entry, and with blanks only. It is not a boat gun, nor is it intended as a lethal boobytrap. They were...