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 Fire Control Group and Internals


Spafford used a fine 3M abrasive pad to polish the back of the hammer as well as the upper and lower rails. One of the reasons AKs need to wear in is to remove the irregularities on the back surface of the hammer where the carrier rides over it. By polishing, everything is smoother from the start.

From here, you need to assemble the rifle. I recommend polishing both the upper and lower rails to remove any burrs. I also polish the back of the hammer and the surface of the hammer where the hooks grab. Note — the intent is only to polish. If you remove too much material, you can alter the geometry of the fire control group and impact functioning.


When people buy new AKs or build an AK for the first time, they complain of sticky actions where the bolt carrier seems to hang on the hammer. Most of the time, this is a matter of wearing in and lubrication. I use CLP on the FCG and dabs of wheel bearing grease on the rails, back of the hammer, sides and bottom of the bolt carrier. This makes for a very smooth action when coupled with the polishing. In all cases, AK actions tend to get smoother as they wear in, so even if you skip this step, the action will improve with time.

I install the hammer and use needle-nose pliers to locate the spring. From there, I install the trigger. Be sure the disconnector spring is installed. Failure to install it will result in inconsistent fire control group functioning.

This is the installed TAPCO G2 FCG, Falcon Arms spring set and Romanian G selector lever. It's not visible from this angle, but the Falcon FCG retaining spring was used. By using all new Falcon springs, any potential headaches caused by worn-out springs are avoided.

Magazine Cover

GET THE MAGAZINE Subscribe & Save

Temporary Price Reduction.

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW OUR CURRENT ISSUE

From Our Family

Historical Handguns: The Model 1917 Smith & Wesson Sixgun

Garry James - November 09, 2018

Designed as a supplemental sidearm in World War I, this .45 ACP sixgun was made to commercial specs and is still a great shooter.

First Look: Springfield Armory XDM 10MM

G&A Staff - October 10, 2018

Featured in the December issue of Guns & Ammo, Springfield Armory has launched its full-size XD(M) in 10mm. It is being made available with either a 4.5-inch or 5.25-inch barrel.

G&A Celebrates 50 Years of Dan Wesson

Eric R. Poole - November 16, 2018

Dan Wesson commemorates its 50th Anniversary with a limited number of engraved, blued-'steel Model 1911s.

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

Get the top Firearms News stories delivered right to your inbox.