Audit .223/5.56x45mm NATO guns with volume, weight, and longest_side

[feinorgh]

Summary

SUMMARY: Content "Audit .223/5.56x45 NATO calibre guns for weight, volume, and longest_side"

Purpose of change

Contribute to #41691, adding longest_side to guns, and to #37374.

Describe the solution

Go through references and source material, download images and estimate profile area, volume, and longest_side based on the tutorial in #37374. Round the values to reasonable values, when needed. Provide reference calculations and images (see below).

Describe alternatives you've considered

Getting hold of actual weapons, submerging them in water to measure their displacement to get accurate volume values. Turns out limited access to firearms and suitable measuring vessels potentially makes this forbiddingly challenging.

Testing

Test suite passes. All guns should be spawnable in-game, and have sane values.

Additional context

Reference and calculation sheet, along with measurement data is here: https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit?usp=sharing

Source images and ImageJ measurement images are here: https://drive.google.com/drive/folders/1RwRXxj5Rg8UmnPbAFz8YzOU2VT7tBWWu?usp=sharing

These were the guns that weren't already reviewed and was missing longest_side:

Remington ACR

This rifle is no longer manufactured by Remington Arms, but has been developed further by Bushmaster, that later recalled all available rifles. To begin with, the weapon came as a system, with interchangeable barrels and stocks, to convert it into different configurations (10 inch barrel for CQB, 14.5 inch barrel for carbine, 16.5 inch barrel for DMR, 20 inch barrel for sniper configuration). However, this version is modelled after a 16.5 inch barrel version, hence the hefty weight.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=93328453&range=A154

AR-15

This is based off an Armalite AR-15 Tactical production rifle. The width of the rifle is based on the thickest part of the lower receiver, off of a CAD drawing, however: it is still an estimate.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=93328453&range=A16

H&K G36

This one turned out to be a bit problematic. According to the official H&K specs, the weapon has an overall width of 65 mm. That, in conjunction with it's relatively large profile area, makes the calculated volume approach 6.5 liters. Compared to other, similar, rifles this seems much too large.

I found a top view image of the image profile, and according to ImageJ, the overall width (that is, the Y dimension in the picture is very close to 66 mm). However, the handguard and the controls is what contributes to this. I guesstimated 50 mm mean width for the weapon, which still makes it large, but not unreasonably so, in my opinion.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=93328453&range=A58

Side view above.

Top view above. NOTE: Images are not to scale.

M249

Again, the source specifications state a width of 110 mm, which may be the overall width. The weapon likely has a lesser average width, so we might be overestimating the volume here. However, the M249 is a hefty piece of machinery, so the values here may be better than the original "2 L", but may need tweaking.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=0&range=A76

M4A1

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=0&range=A21

M16A4

Again, I suspect we may be overestimating the volume a bit for certain guns, depending on how literally we interpret the width specs in the sources. The M16 type carbines/rifles, I've given a width of 60 mm, based on the width of the handguard, but I suspect the actual width is smaller; especially the lower receiver/trigger group/upper itself I would estimate around 40 mm, without the controls (forward assist, etc.).

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=0&range=A34

Ruger Mini-14

In this case, I found it impossible to find any reliable source for the width of the weapon. I estimated 50 mm, based on similar stocks on M14 rifles, but again, these are also guesstimates to a large extent.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=93328453&range=A160

FN SCAR-L

This is based on the FN SCAR-L STD with a 14.5 inch barrel. The SCAR systems have built-in telescoping AND folding stocks, so these measurements are based on a collapsed stock to take up minimum space. The volume when the stock is folded to the side should be practically the same, whereas the "longest_side" would differ. I'm not sure how to best handle this case, though.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=0&range=A28

SIG 552

This weapon should rightly be called SG 552, and really has no business being in North America in the first place, in the current form. It was decommissioned in 2008, in favor of the SG 553.

The SG 550, SG 551, and SG 553, though, have been used by various government agencies, and I suppose a number of civilian versions have been imported to the US, but I imagine these are rare indeed.

Nevertheless, I changed the values to the specs of the Swiss SG 552-P (although no longer in use or existence). Again, no mention of width of the weapon, so I used 50 mm as a reasonable "default" value.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=93328453&range=A168

Steyr AUG

This is based on the modern Steyr AUG A3. However, I suppose most Steyr's in the U.S. might be of earlier types, since they were used by US Immigrations and Customs before being phased out.

https://docs.google.com/spreadsheets/d/10TeuTTjwusbWB9SaH-nq03bMWDyILylU9Btvtu3uTDM/edit#gid=93328453&range=A181

[tenmillimaster]

depending on how literally we interpret the width specs in the sources

If you'd like to get closer approximations, you can slice up the image and proceed as normal with each slice.

[kasper747]

On Build 10876 the Remington ACR length is 5 Inch, which is wrong should be at least 25.8 inch with folded stock, according to Wiki :)

Can you correct it? I am new here, not sure how to o it properly.

[feinorgh]

@kasper747 I am guessing you're looking at the Remington ACR in .300BLK. This has not been corrected yet, but both the 5.56x45mm NATO and .300BLK version should have identical dimensions.
.300BLK will be updated.