MJM Machining

MJM Machining MJM Machining
Established 2024

Specialising in fi****ms repair, alterations and general gunsmithing. Contact Mike Maulder for enquires. 0277403586

06/06/2026

One of our jobs this week , fluting a tikka T3 bolt . As usual the set up is more involved than the actual machining process .

Another thread done , looking at the previous crown you can see how much off the OD of the barrel is to the centerline o...
01/06/2026

Another thread done , looking at the previous crown you can see how much off the OD of the barrel is to the centerline of the bore. Another example of why you cant indicate a barrel in off the outside diameter.

Hey guys , what's your thoughts on this one ? How has this brass most likely been damaged . Anyone had similar experienc...
29/05/2026

Hey guys , what's your thoughts on this one ? How has this brass most likely been damaged . Anyone had similar experiences?

Finally we made a start on the Howa , chambered in 6mm creedmoor. Should have it finished this week .
28/05/2026

Finally we made a start on the Howa , chambered in 6mm creedmoor. Should have it finished this week .

Every now and then were allowed an easy one , this aftermarket scope mount had a stripped screw and damaged internal thr...
28/05/2026

Every now and then were allowed an easy one , this aftermarket scope mount had a stripped screw and damaged internal thread , we just drilled and tapped it out to the next size up 👍

Hey team , this week we looked at fault finding accuracy issue with a mossberg 243. The rifle had been giving inconsiste...
27/05/2026

Hey team , this week we looked at fault finding accuracy issue with a mossberg 243. The rifle had been giving inconsistent results and shifting its zero . We gave it the quick once over to check all the fasteners, then we checked the headspace which was withing specification. Looking at the bolt we noted it was of the floating head design ( not my favorite). Checking out the barrel we could see the bolt had been contacting the rear of the barrel issue 1. Next we checked the barrel using the borescope and could see the chamber was slightly offset and not concentric with the bore issue 2. It was also noted the chamber had zero freebore (no biggie). The barrel had machining marks its entire length with alot of rust pitting and a damaged land about 1.5inches from the muzzle issue 3. There were also some issues with the ammunition which had been loaded for him which didnt help the situation. At this point it was pretty obvious this rifle was never going to reach its full potential no matter how much load development was done . A positive out off all of this is the rifle is at fault and not the shooter .

Another day at it , with all the phone calls ,people stopping in we managed to do a couple of threading jobs and mess u...
22/05/2026

Another day at it , with all the phone calls ,people stopping in we managed to do a couple of threading jobs and mess up the workbench some more 🙄.

Back at it today , we had a 303 British which the bolt wouldn't close , we discovered the extractor was seized,we figure...
15/05/2026

Back at it today , we had a 303 British which the bolt wouldn't close , we discovered the extractor was seized,we figured it was just full of crud around the extractor, what we didnt know was the retaining screw was the problem, the extractor pivots on the screw and it was this pivot point which was rusted up. Of course the screw wouldn't budge and it had been set too with the Wong size screwdriver in the past which had damaged the slot . So after we damaged it some more trying to get it out the only option was to drill down the centre of the screw and use an ease out to remove it . The other problem we found was the extractor slot in the barrel had a big rark in it which wouldn't let the extractor ride up it , so a bit of fine work with the foredom tool to remove the burr and the bolt works like it should .

This week we had a Wi******er Model 70 that needed to be headspaced to a new / second hand bolt. Our other lathe was set...
08/05/2026

This week we had a Wi******er Model 70 that needed to be headspaced to a new / second hand bolt. Our other lathe was set up with something else so we had to go old school and do this job in the steady rest.Now some people think this method is outdated but we have chambered quite a few barrels this way and have produced some extremely accurate rifles. After doing some measurements we found the chamber was too deep with this bolt , so the barrel was set back 1 full turn and the chamber deepened to suit. A quick check with the borescope to make sure the throat was cut square and even 👌.After we torqued the barrel on we checked the barrel timing was correct with the open sights lining up with the top dead centre line of the action .. no room for error here.. We then checked the headspace was correct using the go and no go gauges before re assembly of both the bolt and the rifle . A little bit of work but nessasary to get the rifle back to a safe working condition so it can be used .

Address

Levin
5571

Website

Alerts

Be the first to know and let us send you an email when MJM Machining posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Shortcuts

Share

Category