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

Parkerizing - Part 2

To Parkerize, you need an abrasive blaster, stainless steel tank, heat source and then either a commercial Parkerizing solution or it's even something you can make yourself quite easily. The blue container is used to store the mixture for future use.

A perfectly acceptable Parkerizing solution can be prepared at home with readily available ingredients. I recommend doing this outside on a camp stove or something like that. You do not want to do it inside because of the fumes that will cause all the steel to rust!


The recipe is as follows:


* 2 gallons of distilled water


* 2 "biscuits" of clean 0000 steel wool

* 1 cup of Klean Strip brand Phosphoric Prep & Etch (or other phosphoric acid etching solution around 35-45% concentrate per the Prep & Etch MSDS sheet)

* 6 rounded tablespoons of manganese dioxide (available at pottery supply stores or eBay, which is where I bought mine)


To mix the solution and treat my parts, I have a 6x6x40-inch stainless steel Parkerizing tank I bought off eBay from StainlessSteelCreations1 for approximately $120. The tank is heavily made and has a bung on one end so you can drain the solution into a plastic container for future re-use.

I do my Parkerizing in my driveway to avoid fumes causing corrosion in my shop. My heating system is an old Coleman camp stove running their tried and true liquid white gas but you can use any heating source you like. I get it prepped and heating up with the tank on top. I then add the water first and then the acid. Always add acid to water—never the other way around.


The solution has been mixed and is heating to 190 degrees F. The shredded steel wool is slowly dissolving and "seasons" the solution.

As the solution is warming up, I shred the steel wool, add it to the liquid with the manganese dioxide and gently stir occasionally. The acid will start breaking down the steel wool and "season" the solution. You want the solution to be at 190 degrees. I use a stainless candy thermometer that clips on the inside edge of the tank to keep track and adjust the flame on the stove accordingly.

I get other things done while the solution ages. Once the shredded steel wool has dissolved, I suspend the parts in the tank using stainless wire. With the above formula, it takes about 30-40 minutes to get a real good Parkerized surface. If the bubbling stops sooner, your parts are done and you can pull them out.

The surfaces are Parkerized at this point. The barreled action was lowered into the solution using the stainless steel wire you see here. The front rubber plug has already been removed. The next step is to quickly rinse the action to remove the solution.

As soon as you pull them out, flush them with water thoroughly to remove the acid and stop the reaction. Then spray with WD40 to displace the water. I then apply Ballistol, or whatever oil I have handy, to prevent rust unless I am immediately going to apply the finish. Some guys stop with the Parkerizing because the Manganese Phosphate creates a nice very dark gray finish and they just rub in oil. That is definitely one approach.

If there are any problems with the Parkerizing, such as inconsistent coloring/conversion, odds are the surface wasn't sufficiently clean or you didn't leave it in long enough. You can re-blast that area and put the part back into the Parkerizing solution. I have found this formula very easy to work with as long as the parts are thoroughly prepped beforehand.

At this point, the parts are Parkerized! It really is that simple. I use a plastic blue Kerosene-type five gallon container to store my liquid for future use. The precipitate is considered hazardous waste. You can pour the liquid through a coffee filter and catch the precipitate. Allow it to dry and dispose of it according to regulations in your area.

Recommended for You

Ontario Chief Firearms Officer, Dwight Peer, spoke with TheGunBlog.ca about the Canada-wide surge in buying AR-15 target rifles. 2nd Amendment

Ontario, Canada Chief Firearms Officer Comments on AR-15 Buying Surge and Gun Licensing

TheGunBlog.ca - July 16, 2019

Ontario Chief Firearms Officer, Dwight Peer, spoke with TheGunBlog.ca about the Canada-wide...

No one can restore receptivity to another Trump term with these disaffected gun owners but the president himself. 2nd Amendment

2020 is Trump's to Blow with Gun Owners

David Codrea - July 09, 2019

No one can restore receptivity to another Trump term with these disaffected gun owners but the...

The last of Germany's infamous Elefant tank destroyers. Historical

World War II German Elefant Tank Destroyers

Neal S Shera - July 12, 2019

The last of Germany's infamous Elefant tank destroyers.

See More Recommendations

Popular Videos

Hornady

Hornady's New A-Tip Line of Match Bullets

Hornady Manufacturing, has developed a new line of match bullets. The A-Tip is designed for precision and long-range shooting.

New handguns from Smith & Wesson

New handguns from Smith & Wesson

The Performance Center's M&P380 Shield EZ pistol features ported barrel, flat face trigger and tuned action.

Springfield Armory Saint Victor in .308

Springfield Armory Saint Victor in .308

The Saint Victor in .308 features a 16" light weight barrel, M-LokĀ® free float hand guard and included flip-up sights.

See more Popular Videos

Trending Stories

Rhode Islanders are setting brushfires for freedom once again as they advance a Second Amendment Sanctuary Town movement. 2nd Amendment

SPECIAL REPORT: BIG 2A HISTORY BEING MADE IN LITTLE RHODE ISLAND

John Peterson - May 22, 2019

Rhode Islanders are setting brushfires for freedom once again as they advance a Second...

A $50 Ring Loc-Kit gives AirForce Condor airgunners unparalleled power and accuracy. Air Guns

AirForce Airguns Condor Ring-Loc Kit Review

Tom Gaylord - May 29, 2019

A $50 Ring Loc-Kit gives AirForce Condor airgunners unparalleled power and accuracy.

Please sign and share the petition to get the required 100,000 signatures by July 27. 2nd Amendment

Tell the White House that the 2nd Amendment Was Not Given to the People by Government

Firearms News - July 02, 2019

Please sign and share the petition to get the required 100,000 signatures by July 27.

See More Stories

More Gunsmithing

As someone accustomed to AR-15, M14 and M1 rifles, I can't say I'm a huge fan of the AK-47, but I Gunsmithing

Krebs Enhanced AK Safety

Gus Norcross - May 07, 2014

As someone accustomed to AR-15, M14 and M1 rifles, I can't say I'm a huge fan of the AK-47,...

In the second part of this series, we examine how to build the barrel assembly on an AR-15 varmint upper. Gunsmithing

Building a Heavy AR-15 Varmint Upper Part 2: Barrel Assembly

Gus Norcross - December 31, 2013

In the second part of this series, we examine how to build the barrel assembly on an AR-15...

AGI's new Certified Glocksmith Course includes Complete Disassembly & Reassembly, the GLOCK Gunsmithing

AGI Glocksmith Course

SGN Online Editors - April 09, 2014

AGI's new Certified Glocksmith Course includes Complete Disassembly & Reassembly, the...

See More Gunsmithing

GET THE MAGAZINE Subscribe & Save

Temporary Price Reduction.

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW OUR CURRENT ISSUE

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

×