OK, enough looking at the gun; it's time to shoot it.
Test firing was performed with .223/5.56mm ammunition from Remington, Winchester, IMI, and Federal, with bullets running the gamut from 62 to 69 grains in weight. Besides the 10-round magazine that came with the rifle, I brought along several 20 round M-16 magazines to check the rifle's feeding reliability.
On the 100-yard range, I trekked out to the backstop and set up a series of targets. Then, shooting across sandbag rests, I proceeded to fire three five-shot groups with each brand of ammunition. It took a few rounds to discover that the Model 7615 was shooting a bit to the right but, as I had forgotten to bring my tool kit with me (oh right, like you never forget anything?), I was unable to adjust the ghost ring sight. This in no way affected the actual group results, so I proceeded to send projectiles downrange.
It should be pointed out that at this distance the front sight covered the entire target, but careful centering allowed me to shoot some very respectable five-shot groups, ranging from two inches to slightly over three inches. While a smaller bead up front, or smaller aperture at the rear, would no doubt tighten the groups, I found such performance more than acceptable for an iron-sighted, combat rifle.
During the same range session, I loaded up a pair of M-16 magazines and proceeded to send rounds toward a USPSA target at 50 yards. Firing offhand as fast as I could obtain a sight picture, I went through 40 rounds of ammunition at a fairly rapid clip. (Man! did the barrel ever get hot.) I am happy to report that the 7615 fed, chambered, and ejected cartridges as fast as I could shuck that forearm back and forth. While not actually necessary in a rifle of this weight, chambered for the .223, the recoil pad was very useful as it kept the rifle secure on the shooter's shoulder when operating the pump action.