High Powered Scope - +4 Range (Optional)
.338 Lapua Barrel - +10 Damage, -2 Stability
Accuracy Trigger - +1 Accuracy, -1 Stability
Human Engineered Grip - +1 Accuracy
Shock Absorber - +1 Accuracy, -1 Stability
The High Powered Scope is optional, take it only if you can't aim with basic (cuz just havin a dot in the middle, not an entire cross kinda sux personally i can hardly use it) or you play on long range maps.
Or if you're out of euros just get the lapua barrel and you're done