Posts by Nathaniel F

Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. In addition to contributing to The Firearm Blog, he runs 196,800 Revolutions Per Minute, a blog devoted to modern small arms design and theory. He can be reached via email at

I am using this image because it's awesome. 25_45_animation02 3H0nNxp 7.62x39mm170gr RTX1DOLE-1- 105mm_tank_gun_Rifling IMG_0947 123f remington_r51_10 PHOTO_20160612_010947fixed 1645998_-_main IMG_0947 M16_rifle_Firing_FM_23-9_Fig_2-7 The author's Colt 6920 AR-15, which has given him years of reliable service over thousands of rounds of ammunition fired.

Meet the “Black Rifle”: An Introduction to the AR-15

It’s no good to discuss how firearms work without also giving the context surrounding the firearms themselves. With that said, let’s talk about the AR-15, its copycats, competitors, and relatives. Together these rifles share space under the loose umbrella [Read More…]

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Operating Systems 201: Rotary Locking

We introduced you to the concept of locking in a previous one of our 201-level posts on how firearms work, and today we’re going to talk about what has become the most common locking mechanism for rifles: Rotary locking. If to lock an action, you need to create [Read More…]

This short-recoil operated SIG P220 uses a tilting-barrel locking mechanism. You can see how the slide is prevented from moving rearward by the front surface of the barrel in this image. 0cf617183d35ad105dbccd5125cdf960 That is what happens when a wound channel collapses on itself so quickly that it sets the air on fire. PHOTO_20160612_011121fixed The 1927 model Bang rifle, paradoxically uses the simpler and more advanced gas trap operating system! RSC1917 Image courtesy of C&Rsenal P1070430 635714301594220050-HX3A7988 NLmpDT6 P1070410 5-45-x-39-pmag

Magpul Introduces 5.45mm-Compatible AK Magazine

Rumors of a new Magpul magazine for the AK-74 platform are confirmed: The company has just released the PMAG 30 AK74 MOE magazine, designed to hold 30 rounds of 5.45x39mm ammunition and compatible with all 5.45mm caliber AK rifles that take traditional AK-74 pattern [Read More…]

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LEAKED: Kalashnikov Concern’s New RPK-400 Dual-Feed 5.45mm SAW

An image of a mysterious new Russian machine gun was leaked to the public recently, during a visit to the Kalashnikov factory by Deputy Defense Minister Yuri Borisov. The weapon is an intriguing dual-feed magazine/belt loading gun that features distinctly un-AK-like [Read More…]

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