How airsoft and BB gun magazines work

by Tom Gaylord
Writing as B.B. Pelletier

Today’s report is another guest blog from reader Ian McKee who writes as 45 Bravo. Today he tells us how airsoft and BB magazines work.

If you’d like to write a guest post for this blog, please email me at: [email protected].

Okay — take it away 45Bravo!

Ian McKee
Writing as 45Bravo

How Airsoft and detachable BB gun magazines work

This report covers:

  • It’s a replica thing
  • Low/mid capacity
  • Most of them are very similar
  • Magazine capacities
  • High capacity
  • It’s high capacity clockwork!
  • Summary
  • Coming in the future

It’s a replica thing

A lot of replica air guns have removable magazines to replicate the look and function of the actual firearm they are copied from. 

magazine lineup
From left to right, is a real 5.56/.223 30 round magazine, a 70 round mid-capacity mag, a “20 round” mag that actually holds 150 rounds of airsoft ammo, a 300 round mag, and a 850 round “fatmag”.
read more


SigAir ProForce MCX Virtus AEG airsoft gun: Part 6

by Tom Gaylord
Writing as B.B. Pelletier

Virtus AGE right
SigAir ProForce MCX Virtus AEG right side.

Part 1
Part 2
Part 3
Sig Romeo5 XDR red dot sight
Part 4
Part 5

This report covers:

  • The test
  • Sig 0.20-gram BBs
  • Discharge sound
  • TSD Tactical black
  • TSD Tactical white
  • Summary

Today is the final test of the Sig ProForce MCX Virtus airsoft gun. So far we have tested the velocity and accuracy of 0.20-gram and heavier BBs with the 120 mainspring the gun came with. Then we swapped in the 110 mainspring that was also included and tested the gun all over again.

Today we test the accuracy of the gun with the 110 spring and 0.20-gram BBs. Let’s get right to it.

The test

I shot outdoors at 10 meters. The gun was rested on a sandbag. The Romeo5 XDR dot sight is still zeroed from Part 4.

Sig 0.20-gram BBs read more


SigAir ProForce MCX Virtus AEG airsoft gun: Part 5

by Tom Gaylord
Writing as B.B. Pelletier

Virtus AGE right
SigAir ProForce MCX Virtus AEG right side.

Part 1
Part 2
Part 3
Part 4

This report covers:

  • 110 mainspring
  • BUT
  • Prediction
  • Changing the mainspring
  • Assembly
  • Performance
  • 0.20-gram BBs
  • Rock and roll
  • 0.25-gram BBs
  • Battery
  • Summary

Today we’re going to have a little fun. I know some of you would like to work on spring-piston airguns but you just don’t want to jump into the deep end of the pool — as in buying expensive tools like a mainspring compressor and parts that may or may not work as you expect. Today we are going to change the mainspring in the SigAir ProForce MCX Virtus AEG airsoft gun, and we will do it with two Allen wrenches — nothing more! This is a job any of you can do. Then we’ll test the velocity of the gun and see what impact the new spring has made. read more


SigAir ProForce MCX Virtus AEG airsoft gun: Part 4

by Tom Gaylord
Writing as B.B. Pelletier

Virtus AGE right
SigAir ProForce MCX Virtus AEG right side.

Part 1
Part 2
Part 3

This report covers:

  • A discovery!
  • The test
  • ASG 0.25-gram Open Blasters
  • TSD Bio 180 0.26-gram BBs
  • TSD 0.28-gram Tactical BBs
  • ASG 0.30gram Blaster Devil BBs
  • Full-auto
  • Summary

Today I’m shooting the Sig ProForce MCX Virtus AEG  with heavier BBs than Sig recommends. You will be able to compare today’s groups with those from Part 3 to see which BB you think is best.

A discovery!

Before we begin I need to tell you about a discovery I made. In the last report the 0.20-gram BBs that Sig supplied with the gun were not feeding well from the magazine, nor were 0.25-gram Stealth BBs. In today’s first test I had the identical problem and discovered that it isn’t the BB; it’s the magazine. It does not like feeding the last four BBs when it’s in the semiautomatic mode. So, for all of today’s test I filled the mag with way more than the 10 shots I needed and after the target was finished I went full-auto outdoors in a safe direction with the BBs that remained. All four of the BBs I tested today fed perfectly that way. read more


SigAir ProForce MCX Virtus AEG airsoft gun: Part 3

by Tom Gaylord
Writing as B.B. Pelletier

Virtus AGE right
SigAir ProForce MCX Virtus AEG right side.

Part 1
Part 2

This report covers:

  • Accuracy
  • HOWEVER
  • Romeo5 XDR red dot sight
  • Sig BBs|
  • 0.20-gram TSD Tactical White BBs
  • 0.20-gram TSD Tactical Black BBs|
  • 0.20-gram Marui Black BBs
  • 0.25-gram Stealth BBs
  • Rock and Roll
  • Discussion
  • Summary

I said in Part 2 that there was a lot to test with this SigAir ProForce MCX Virtus AEG airsoft guns, and today I discovered I was understating the case. You’ll see why as we progress.

Accuracy

This is the beginning of the accuracy test and it’s good to remind ourselves what this airsoft gun is meant for. It’s meant for skirmishing, which means shooting people, not targets. However, the best way to get it on target and properly adjusted is still the old-fashioned way of shooting at paper.

HOWEVER

The However today is all the variables. I will be shooting many different BBs, adjusting the Hop Up and adjusting the Romeo5 dot sight — each of which makes the equation more complex. I did not think about that until I was well into the test. read more


SigAir ProForce MCX Virtus AEG airsoft gun: Part 2

by Tom Gaylord
Writing as B.B. Pelletier

Virtus AGE right
SigAir ProForce MCX Virtus AEG right side.

Part 1

This report covers:

  • My strategy
  • Sig BBs
  • Weight
  • Getting the gun ready to fire
  • Loading the magazine
  • Use the speedloader
  • The follower needs more BBs
  • Velocity 0.20-gram Sig BBs
  • Sound and feel of the shot
  • Rock and Roll
  • More about the speedloader
  • 0.25-gram BBs
  • Full auto accuracy
  • 0.30-gram BBs
  • Trigger pull
  • Summary

Today I start reporting on the velocity of the new SigAir ProForce MCX Virtus AEG airsoft gun. I say “start” because I can’t get the full report in a single day. You will recall that Sig enclosed a 110 mainspring for me to try, as well as the 120 that’s in the gun as it comes. The 110 spring is lighter, so two things should happen. The velocity should drop a little and the rounds per minute (RPM) should increase, because the electric motor is turning the gears against less force.

My strategy

I could either replace the spring and do the second velocity test next or I could go on to the accuracy test with this spring and then do the spring swap and test everything again. I think I will do the latter for a couple reasons. It’s easier, and I am into easier. And, even if I were to do anything wrong while making the spring swap, we will at least get one complete test. read more


SigAir ProForce MCX Virtus AEG airsoft gun: Part 1

by Tom Gaylord
Writing as B.B. Pelletier

Virtus AGE right
SigAir ProForce MCX Virtus AEG right side.

This report covers:

  • Spring piston
  • Battery basics
  • Avalon gearbox
  • Replacement M110 spring
  • This gun
  • Sights
  • Magazine
  • Velocity
  • Hop Up?
  • At what price?
  • Discussion
  • Summary

I did a search in the blog archives and could not find another report I had written about automatic electric airsoft guns (AEG). I have done some large articles about AEG in the past for Shotgun News and for my own newsletter. I even wrote two articles for Pyramyd Air about the basics of batteries for airsoft guns — one in 2008 and the other in 2009. Those articles are still good today — 10 and 11 years later.

Spring piston

An AEG is a spring-piston gun whose piston is retracted (cocked) and loosed by a mechanical gearbox that’s powered by a small high-torque electric motor. To power the motor a battery is contained somewhere inside the gun. There is a great animation of how an AEG works on Wiki. read more