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Steel cased Monarch is made by Barnaul.

From the Barnaul web page:

Superior Quality & Reliability
Russia's premier ammunition manufacturer has over 100 years of experience in ammunition excellence. All Barnaul Ammunition are non-corrosive, new production and use environmentally safe primers.

I doubt seriously that Monarch is corrosive.

However, assuming he was correct, the cleaning after corrosive ammo involves patches and wiping with a roughly 50/50 water/ammonia mix.

You're probably not doing that as part of your cleaning.

I'll see if I can find anything definitive on Monarch being corrosive.

NguyenVanDon wrote:Yeah, the aluminum cased for the Blazer is the worst experienced for me. Even with the Glock, when I try to feed it and pull the slide back, it jams up right there. With Monarch, I never had a problem like that. I'm scared to use Blazer now.

My own personal opinion is that most difficulties encountered with regular Blazer ammunition are due to a different lubricity of the aluminum and not due to poor quality of the ammunition.

Thus, tolerances of a gun or how vigorously a gun feeds and extracts may be responsible for poor functioning in some guns.

I never had a problem with any aluminum Blazer. I bought mainly 9mm, when I didn't consider it worth reloading and .45 Colt because they had a good defense load. Since the introduction of Blazer Brass, I have used sizeable amounts of 9mm, .40S&W, and .45acp without issue.

As I understand it, there are two varieties of Monarch sold by Academy.

One is a steel cased version, produced in Russia.

The other is a brass cased version, produced in Serbia.

If that is correct, I think we should know which one is being discussed.