Skip to main content

Building a Hybrid Yugoslav M70B1 from a Stub with Screws

Building a Hybrid Yugoslav M70B1 from a Stub with Screws

George Spafford is building a replica of the Yugo M70B rifle using a stub parts kit. A new installment will appear here every Friday

Install the Barrel — Part 1


Here, an AK-Builder barrel press jig holds the trunnion in proper alignment as Spafford uses his 20-ton press to push the barrel back into place. It's critical to have the barrel straight, not only to avoid canted sights but also any potential binding problems that could cause the barrel to bend. Take your time, and if it feels like too much pressure is being required, stop and carefully inspect everything in case something shifted and is misaligned.


Next up is the reinsertion of the barrel. I put the barrel in the freezer for a few hours so it can shrink. When ready to install it, I insert the receiver and trunnion assembly in a vise and first polish the inside of the trunnion with emery cloth to remove any burrs. You want to remove as little material as possible. I then warm the trunnion with a heat gun so it will expand and apply a light coat of Permatex non-seize coating to help the parts slide together.

At this point, I get the barrel from the freezer, run out to my shop, align the barrel to the front trunnion by sighting down the "ears" of the trunnion and lining up the rear sight block (RSB) on the barrel, and then press the parts together by hand. I quickly double-check the alignment and give a few whacks with a mallet on the protected muzzle end to seat the barrel further.

To be clear, I use a beat up old muzzle brake that I cut flat on the end. Some guys have very good luck using a old blank firing adapter for the same purpose. Regardless of the method, you want to protect the muzzle from damage.

After this initial start, I take the receiver and barrel assembly to the press to finish the job using an AK-Builder barrel jig. There are a number of other proven methods including using a mallet for the whole job, air riveters, threaded rod and other press jigs.




As you get close to the original pin location, take it nice and slow. Clean out the channel with a Q-tip or pipe cleaner so you can clearly see how the parts are coming together. Trust me, it is much easier to press the barrel in than to try and press it back out — especially if you don't have the tools to do so.

Take your time and make sure the barrel channel lines up. This will be the starting point for checking headspacing. With a worn M70, you probably will need to adjust the headspace and use an oversize pin — George did and that will be discussed in the next installment.


GET THE NEWSLETTER Join the List and Never Miss a Thing.

Recommended Articles

See More Recommendations

Popular Videos

DL Sports SLR 762 Carbine

DL Sports SLR 762 Carbine

Patrick Sweeney tests out the DL Sports SLR 762 Carbine, an AK47 has been refined and civilized by Dave Lauck and DL Sports.

Shooting the 20mm Lahti

Shooting the 20mm Lahti

David Fortier had the chance to fire the Lahti L-39 while filming the 2018 season of Guns&AmmoTV while on location at DriveTanks.com.

See More Popular Videos

Trending Articles

This article will walk you through the process of building a Glock pistol from an 80 percent frame.How To Build a Glock From an 80 Percent Frame Gunsmithing

How To Build a Glock From an 80 Percent Frame

Gus Norcross - August 13, 2020

This article will walk you through the process of building a Glock pistol from an 80 percent...

Developed to replace the venerable AK-74, the Blow-Back Shifted Pulse AN-94 Nikonov is a fascinating hyper-burst design which faded away after the death of its designer.Russian 5.45x39mm AN-94 Nikonov Review Rifles

Russian 5.45x39mm AN-94 Nikonov Review

David M. Fortier - August 14, 2020

Developed to replace the venerable AK-74, the Blow-Back Shifted Pulse AN-94 Nikonov is a...

Anarchy Outdoors has introduced a series of upgrades for the T/C Compass and Venture rifles.Anarchy Outdoors Introduces Upgrades For T/C Compass and Venture Rifles Rifles

Anarchy Outdoors Introduces Upgrades For T/C Compass and Venture Rifles

Firearms News Staff - August 22, 2020

Anarchy Outdoors has introduced a series of upgrades for the T/C Compass and Venture rifles.

For the first time in its 35-year-history, the annual Gun Rights Policy Conference hosted by the Second Amendment Foundation and Citizens Committee for the Right to Keep and Bear Arms will be a virtual online event, due to the current COVID-19 situation.2020 Gun Rights Policy Conference Is Online Event Due to COVID-19 Industry

2020 Gun Rights Policy Conference Is Online Event Due to COVID-19

Second Amendment Foundation - July 16, 2020

For the first time in its 35-year-history, the annual Gun Rights Policy Conference hosted by...

See More Trending Articles

More Gunsmithing

There are two ways to go when purchasing tools: heavy duty professional grade for daily use orIndustrial Grade AR Tools Gunsmithing

Industrial Grade AR Tools

Gus Norcross - March 10, 2014

There are two ways to go when purchasing tools: heavy duty professional grade for daily use or

I rolled onto the range late in the afternoon with a couple rifles to test-fire. I had it all toSavage Trigger Upgrade From Sharpshooter Supply Gunsmithing

Savage Trigger Upgrade From Sharpshooter Supply

Gus Norcross - April 02, 2014

I rolled onto the range late in the afternoon with a couple rifles to test-fire. I had it all...

Cerakoting of firearms has become hugely popular, more so for decoration than protection, although the finish does both.Cerakote - The Hottest Finish in Firearms Gunsmithing

Cerakote - The Hottest Finish in Firearms

James Tarr - February 14, 2019

Cerakoting of firearms has become hugely popular, more so for decoration than protection,...

There was a time (a couple decades ago) when most 1911 front sights were staked in place as JohnHow to Stake a Trijicon 1911 Front Sight Gunsmithing

How to Stake a Trijicon 1911 Front Sight

Gus Norcross - May 29, 2014

There was a time (a couple decades ago) when most 1911 front sights were staked in place as...

See More Gunsmithing

Magazine Cover

GET THE MAGAZINE Subscribe & Save

Digital Now Included!

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW OUR CURRENT ISSUE Arrow

Buy Digital Single Issues

Don't miss an issue.
Buy single digital issue for your phone or tablet.

Buy Single Digital Issue on the Firearms News App

Other Magazines

Special Interest Magazines

See All Special Interest Magazines

GET THE NEWSLETTER Join the List and Never Miss a Thing.

Phone Icon

Get Digital Access.

All Firearms News subscribers now have digital access to their magazine content. This means you have the option to read your magazine on most popular phones and tablets.

To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine.

Get Digital Access

Not a Subscriber?
Subscribe Now