Here are some cuts from a review of the guide gun:
The Marlin Guide Gun is designed to be a fast handling short to medium range rifle. Used as the name implies, it is a secondary implement to back up a client in the event of an emergency. The short barrel length combined with the straight stock give it the pointing characteristics closer to a shotgun than a rifle. In fact, the Remington 870 with a 18� barrel is approximately 1� longer than the Guide Gun. Although it is extremely fast to put into action, engagement of long range targets are definitely more of a challenge. The stock is of sufficient length to allow enough room when using a scope. My only complaint is that the relatively narrow lever loop may cause some problems when wearing heavy gloves.
To even further my chances of obtaining the best accuracy out of the guide gun I used Hornady�s LEVERevolution 325 grain ammunition, a polymer point bullet designed specifically for lever action rifles. The guide gun did not disappoint! I was amazed and pleasantly surprised at the 1.5� groups at 100 yards. Shooting the 45-70 lets you know that you�ve just touched off some serious firepower, with the accompanying muzzle blast.
My take of the review, big knock down power at "SHORT TO MED RANGE" and "LOUD". Sorta like what was mentioned here earlier in the thread. And remember the guide gun is factory ported.
FDXX75