Table 5. Test 5 results.

Standing results without masks Standing results with mask
Weapon Accuracy Time (Sec) Weapon Accuracy Time (Sec)
SAW 4.73% 1132 SAW 6.12& 1013
Colt 10.70% 1355 Colt 9.18% 1138
Ultimax 9.80% 1272 Ultimax 8.64% 1300
HK 13.51%
1621 HK 10.99% 1926

Table 6. Test 6 results.

Kneeling results without masks Kneeling results with mask
SAW 3.85% 1116 SAW 5.40% 1131
Colt 8.24% 1309 Colt 10.63% 1304
Ultimax 10.70% 1410 Ultimax 9.00% 1459
HK 11.22% 1490 HK 14.59% 1753

Table 7. Test 7 results.

Task Range (M) Time (Sec) RD
1 200 5 6
2 300 10 6
3 100 10 6
4 300 15 6
5 100,300 20 12
6 200,300 20 12
7 100,200,300 25 18

Figure 4.

Weapon Hits Rounds Saved Rounds Accuracy
SAW 43 3102 728 1.81%
Colt 50 3102 526 1.94%
Ultimax Not available for this event.
HK 88 3102 641 3.58%

Table 8. Test 8 results.

During Test 2 minor issues developed with each of the weapons systems. S******* repeatedly had negligent discharges with the Colt, attributable to the Marines forgetting the difference between the closed-bolt M16A2 and the open-bolt AR. The young Marines kept riding the bolt home on a live round, thereby firing the round. With the Ultimax, the s******* realized that the sights were set too low in the rear. Once they achieved stock weld the sights proved to be lower than the eye could see, forcing stock weld to be broken and causing the shooter to search for the sights. With the HK the 3.5 power magnification proved too much at 25 and 50 yards but beneficial at 100 yards. Overmagnification at shorter ranges slowed down the presentation of the weapon onto the target. For the M249 SAW, the weight and length in general made this an extremely cumbersome weapon in field firing positions. Another problem resulted from the commonality of the Colt AR and the M16A2. The familiarity led to initial accuracy, as the young Marines had not yet become familiar with the other weapons.

Test 3 was fired from the prone position, using bipods for stability, engaging popup targets ranging in distance from 50 to 300 meters, with a varied time limit (See Table 3.) A 20-target exposure using 40 rounds was fired from Field Manual 23–9 (FM 23–9), M16A1 and M16A2 Rifle Marksmanship Table I. (See Figure 1.) This evaluation determined quick reaction from a defensive position to an attacking enemy.

Test 4 occurred on the same range as Test 3, firing Table II of FM 23–14, M249 Light Machinegun in the Automatic Rifle Role (see Figure 2), the SAW transition course of fire. A shooter in the prone position with 66 rounds engaged popup targets ranging in distance from 100 to 300 meters with a varied time limit. (See Table 4.) This test again gave the M249 the benefit of the doubt by firing a course of fire designed for the light machinegun. However, the only weapon that could qualify as a light machinegun, the M249 SAW, posted the worst results.

Test 5 was fired using long-range popup targets without team leader assistance. Targets ranged from 250 to 800 meters. (See Figure 3.) Testing employed a 20-target exposure firing 100 rounds per weapon from a supported prone position with varied time exposures. (See Table 5.)

The results from Test 5 identified difficulties for a single shooter to engage targets beyond 300 meters. To effectively and accurately engage targets at these ranges, weapons systems need to be operated by a team, fired from a tripod, and assisted by team leaders using magnified optics.

Tests 6 and 7 (see Tables 6 and 7 for test results) consisted of field firing at elevated targets (simulating urban patrol engagements) placed at distances of 100 to 150 meters. The targets were automated, three-dimensional “Ivan” popup targets. A 5-target exposure was used and engaged with 15 rounds with no time limit, but total time for each shooter was recorded. S******* fired from standing and kneeling positions with and without the field protective mask.

Test 8 consisted of night fire on an automated range with targets arrayed from 75 to 300 meters. (See Figure 4.) Ambient light was less than 20 percent. All weapons were zeroed with PEQ–2s using the laser bore light prior to the range. (See Table 8.) The Ultimax 100 was not tested because there was no way to mount the PEQ–2 to the weapon.

The final evaluation of the assessment was aimed at capturing intangible characteristics and qualities of the weapons that numeric data could not capture. Marines involved in the test filled out a shooter evaluation questionnaire that attempted to capture the intangibles of each weapon. The comparison of these questionnaires with actual range performance produced some interesting results. On average, during Tests 1 through 4 the 48 s******* preferred the weapons in the following order: Ultimax 100, HK, Colt, and M249 SAW. The questions on the questionnaire focused on nine areas: (1) overall performance, (2) using system sights, (3) detecting and identifying targets, (4) adjusting windage, (5) adjusting elevation, (6) adjusting weapons zero, (7) maintaining zero, ( malfunctions, and (9) stoppages. Even though the Colt fired the most accurately in most stages, it was next to last in shooter preference.

Recommendations for modifications were requested for each of the weapons systems. The M249 and Colt were viewed as too heavy. The HK failed to stay on target in burst fire while the Ultimax sight system did not present to the eye at all. When the shooter laid his cheek on the stock of the weapon and achieved a proper stock weld he found the sights of the weapon lay below the line of sight capability of his eye. Accuracy—although according to raw data better than the current M249 SAW in every test—was of such a limited amount as to be statistically insignificant. Only on Test 3 did any weapon outperform the SAW by more than 10 percent accuracy.

“Automatic fire is inherently less accurate than semiautomatic fire.”15 The difficulty becomes achieving a balance between weapons that provide a combination of the accuracy of semiautomatic fire while maintaining the ability to employ full automatic fire when required. This is the reason the Marine Corps modified its BARs so they could fire semiautomatically—to provide both capabilities.

Infantrymen feel strongly about replacing the M249 SAW with a true AR inside the fire team but feel just as strongly about keeping the M249 SAW for its automatic fire suppressive capability. Given the results of this assessment, accuracy alone is not a strong enough reason to replace the M249 SAW. However, most would argue that accuracy was never the problem with the M249 SAW. The problem with the M249 SAW was the lack of mobility when manned by an individual while attempting to move at the pace of a rifle team.

The M249 SAW provides the accuracy that fire teams and squads require. The quantitative tests of Phase I proved the variation in accuracy between the M249 SAW and its competitors small enough to not be worth the time, money, and effort to replace it. Despite the mitigation of the accuracy issue, the M249 SAW could not meet the requirements of mobility and semiautomatic fire accuracy.

Unfortunately, the competitors tested during Phase I of the AR assessment do not appear to offer what the Marine Corps needs. As stated previously, the HK failed to stay on target in burst fire while the Ultimax sight system did not present to the eye at all. The commonality of the Colt AR with the M16A2 appeared to be advantageous. Yet the Colt proved to be the only weapon that experienced negligent discharges during the firing of 120,000 rounds. This fault resulted, in part, from young Marines failing to understand the open-bolt system but also, in part, from weapon design. Open bolts are inherently dangerous. Traditionally, we fear carrying an open-bolt weapon in the condition one mode of ready to fire. The primary shooter can be trained to be safe with the weapon, but primary shooter casualties will soon place the weapons in untrained hands, quickly leading to friendly fire hazards.

Using the assessment as a “jumping off” point, at the conclusion of Phase I of the AR test, a universal need statement (UNS) was drafted and submitted through 1st MarDiv. The statement requested that the M249 be replaced with a “true” AR. The weapon envisioned would fire 5.56mm ball ammunition, be capable of receiving the M16A2’s 30-round magazine, and would possess a selector lever that went from safe to automatic to semiautomatic (in that order), weigh less than 12 pounds loaded, employ sights equal to the M16A2, use clip-on bipods, and have a 450 to 600 rounds per minute rate of fire.

Phase I testing did not provide a “yes” to the original question—“is an AR more accurate than the M249 SAW?” It did, however, highlight the need for a mobile AR, capable of semiautomatic fire at the fire team level. Further, it illuminated the need to address the future employment and role of the M249 SAW light machinegun and a “true” AR in the fire teams, squads, and platoons of the Marine Corps.

Because of the results achieved in Phase I, testing carried forth with the same automatic weapons into Phase II. Experimental squad and platoon organizations were constructed in order to examine the idea of consolidating the SAWs at various levels of command. The next article in this series will fully addresses the AR UNS submitted by 1st MarDiv and the issues that arose from the experimental organizations.