As a follow-on to my earlier post analyzing the LSAT project, I provided this table with the best comparative data that I can find. Note of course that LSAT systems are prototypes, and weights might change should these come into production. All LSAT data is for the more successful polymer-cased, telescoped (PCT) rounds.
First, the machine gun table:
|Weapon||M249 SAW||Stoner 96||LSAT LMG||M240B||LSAT GPMG|
|Unloaded Weight||17 lbs||10.5 lbs||9.4 lbs||27.6 lbs||14.7 lbs|
|Caliber||5.56 NATO||5.56 NATO||5.56 PCT||7.62 NATO||7.62 PCT|
|Ammo weight (200 rd belt)||6.92 lbs||6.92 lbs||3.8 lbs||13.4 lbs||7.5 lbs|
|Loaded Weight||23.92 lbs||17.42 lbs||13.2 lbs||41 lbs||22.2 lbs|
The 6.5 mm PCT round is very nearly the same size and weight as the 7.62 mm PCT round, so the 6.5 is omitted for simplicity. This also provides a better comparison with the existing M240B. A 200 round belt was used for ease of comparison, though 100 round belts are also commonly used.
Now, the carbine table:
|Weapon||M4 Carbine||LSAT Carbine|
|Unloaded Weight||6.5 lbs||6.5 lbs|
|Caliber||5.56 NATO||5.56 PCT|
|Ammo weight (30 round magazine)||1.05 lbs||0.69 lbs|
|Loaded Weight||7.55 lbs||7.19 lbs|
The carbine designs are less well developed. I don’t have enough data on the prospective 7.62 mm/6.5 mm PCT ‘battle rifle’ to include it in the table (specifically, I lack the weight of a loaded magazine). We can see that the weight savings are much less significant here, amounting to 2.5 lbs for a standard combat load of 210 rounds. Which is nice, but not quite as massive as the savings for machine gunners.