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The Beretta 92 Series (simply click the following post) does not have an over-travel adjustment as a stock option. Having an over-travel stop is a big problem for performance. For this reason, you shall need to buy a steel trigger to replace the plastic one (costs about $15). Drill a hole within the trigger as high up as it can be, tap it out for 6 x 32 tpi and install a set screw so that you've got an adjustable over-travel stop.
The M9 Beretta is one of the most well know pistols in the world, entering USA military service within the mid 80s. Due to its quality craftsmanship and high durability, it has the capability to fire under extreme heat and cold and even after being buried in mud, sand, snow and salt water. Add in a high capacity magazine as well as a low recoil, it is easy to determine why the M9 quickly became the standard sidearm for military personnel.
To be accurate for bullseye pistol shooting, the barrel must be match grade. Bar-Sto and KKM Precision both make good barrels for the Beretta, and you may get great results from just using a drop-in barrel. Contrary to common belief, there's absolutely no need to employ a bushing at the front of the barrel to improve lock-up on a Beretta. The barrel locks up at the back against the slide using the locking block that is attached to the barrel, so it is crucial that your particular locking block is tight as well as in good condition. If you are installing a barrel that needs fitting, you will be removing material from the back of the barrel until the gun will go into battery reliably. Make certain and apply Dykem or any other layout fluid between removing material to view where the contact points are. You want as much contact as possible between the back of the barrel and the breech face on the slide. Some barrels (Bar-Sto) have extra material along with the back of the barrel and some of this has to be removed slowly. The point of the extra material on these barrels is to get a tighter lockup with more contact surface, plus center the back of the barrel vertically on the breech face.
The UHC M9 features a spring pistol firing mechanism which permits its users to shoot as fast since they can cock the gun. This is a great pistol if you're just starting to get into Airsoft or if perhaps you just want to shoot some cans within your basement or backyard. You will enjoy hours of fun when you take down your targets with a deadly aim. Conversely, for anyone who is already an avid Airsoft enthusiast, then the UHC M9 is a must have for your collection. In any case, this pistol delivers great performance at a really low price.
To improve lockup, some guns have set screws installed running up under the frame rails through the back of the barrel to give extra contact points while everything is locked in battery.
To improve service life, some gun builders modify the frame rails and replace sections of the aluminum rails with pieces of steel, affixed with screws. This is only necessary if you're a top level competitor and need that extra 2% performance that comes with a super tight frame-to-slide fit, plus the durability of steel on steel vs steel on aluminum. There are no "kits" for doing this kind of work, so you will need to have this kind of work produced by someone that knows what they can be doing. This type of improvement of slide-to-frame fit is similar in nature to the "Accu Rail" improvement that used to be done on 1911 style pistols.
Lastly, sights. If you replace the rear sight with an over-sized adjustable sight, it is common to need to trim down the top of the firing pin blocker lifter to keep it from hitting the bottom of the sight. You'll also need to get a taller front sight. The front sight can be welded on (less common) or you may get one that slips over the stock front sight and pins in place (more common) or you may get the slide milled out with a dovetail (uncommon). Beretta makes an adjustable rear sight that allows you to keep the stock front sight and not have to modify the blocker lifter, but it is more low-profile than most competitive shooters will be going to want.