The TRs-301 has selective fire modes (single shot, 3-round burst fire, fully automatic) which allows it to adapt to close quarters battle to mid range combat with relative ease. It has decent accuracy and reasonable stopping power in all three games, but will fall short on reliability during extended fire-fights. Its picatinny rails allow it to mount both a SUSAT Scope and a M203 Grenade Launcher, and it can also mount a silencer in Shadow of Chernobyl and Call of Pripyat. The weapon requires an upgrade to mount a grenade launcher in Clear Sky.
It is the lightest assault rife in all three games, however it has mediocre durability and will jam frequently after 1/4 damage, opting one to either repair or replace the gun frequently. The weapon uses 5.56x45mm ammunition.
The rifle can be fitted with a SUSAT scope, an under-barrel M203 grenade launcher and a silencer.
Since every weapon in Stalker: Shadow of Chernobyl has quite good reliability (it's because there is no way to repair damaged weapon), TRs-301 is quite reliable too (at least it's much better than in other games). Thanks to it TRs is one of best weapons available in game (especially when you manage to find one in top condition) due to very good accuracy (a little better even that GP37), enough stopping power and low weight. With this advantages TRs is good enough even in Chernobyl NPP, but you will not want to shoot with it in automatic mode if you don't want to swap to SGI 5k or GP37 because of damaging your weapon.
Sniper TRs-301 — A unique version made by the Mercenaries, sporting an integrated silencer, and SUSAT scope, at the cost of significantly reduced firing rate. The sniper variant also does not seem to suffer from the 20% stat penalty caused by a mounted silencer and is noticeably more durable than the stock model.
The weapon can mount a SUSAT Scope and silencer without any upgrades, however a modification is needed for it to mount an under-barrel M209 grenade launcher. It's inexpensive to maintain, and uses the same upgrades as most 5.56mm class assault rifles. It tends to jam more than most rifles, but is still a good deal more reliable than the IL 86. Firing the weapon in 3 shot bursts or in single shot will reduce the rate it is damaged firing compared to it being fired on full-auto all the time. Overall, due to poor reliability it looses with Eastern weaponry available at the moment when you will first encounter TRs-301.
Its rate of fire is higher than most other rifles, the accuracy is better than the IL 86, and the handling is on par with the Viper 5. It also weighs less than most other assault rifles, and it is one of the two assault rifles that can accept a scope, silencer, and grenade launcher by default, making this weapon one of the most versatile weapons overall.
It can even out damage the SGI 5k due to it's rate of fire, but it has some drawbacks – it has low durability without upgrades, which rapidly deteriorates its accuracy and recoil. In fact, out of all weapons in the game it is the most affected by wear, and it has the lowest durability of any assault rifle.
Keeping it in top condition is a must as once it's durability is reduced by 1/4, it will start to jam very frequently and often in the most inconvenient of times such as during a heated firefight. Durability damage rate can be more-or-less lessened by firing the weapon in single shots or in bursts of 3.
Overall, TRs' reliability is still better than in Clear Sky and not much worse than other weapons and thanks to many advantages of using this weapon TRs may serve as player's main weapon through whole game, until he'll manage to get his hands on FT-200m.
The TRs-301 is used almost exclusively by experienced Loners and Mercenaries operating throughout the Zone, making it fairly easy to obtain one early on. Some Freedom members, mostly Experienced, make use of the TRs alongside the IL-86.
Zaton - at the very north of swamps (north of that big lake), hidden in some bushes, along with 120 5.56x45mm SS109 bullets and 4 M209 grenades (you will get coordinates after telling Gonta about Magpie without telling about him to any of faction leaders).
Zaton - under one of the houses in the Izumrudnoye village, along with 120 5.56x45 SS109 bullets and 1 bandage (you will get coordinates after finishing The Hit mission).
Jupiter - under a red metal transport crate in a tunnel where one has to retrieve the Altered Insulator, along with 240 5.56x45 bullets. Player must take care as there is a Tesla anomaly roaming about there with many Electro anomalies assisting to it.
The LR-300 in all the Stalker games is modeled off the 2001 version of the rifle.
Like almost all weapons in the game, the TRs-301 uses a mirrored model.
Moreover it must be noted, that in-game the weapon ejects casings through a closed dust cover, which is nonsense, as all AR-15 offspring feature a spring-loaded dust cover, which will slam open when the bolt is locked, and stay open until manually closed. Note that not all AR-15's have a dust cover or a forward assist, this simply depends on the version or manufacturer.
Additionally, the dust cover locks open once the charging handle is pulled, and must be manually closed after firing. However, the rifle's dust cover in-game closes automatically after cocking.
In early builds, the TRs' forward assist had a complete pull animation when it was reloaded. In all official games however, it's always static.
For some reason, all three games have misaligned iron sights with this weapon (the gun would shoot higher than what you're aiming at in reality). Proper alignment requires that you see the centre of the front sight (the three blades at the front) through the centre of the ring that forms the rear sight.