I am looking to turn my JG G36C into essentially a sniper rifle to match my play style with CQB capabilities along with long range decimation. The stock barrel length is 247mm/9.7 inches, the barrel i want to put into it is 363mm/14.3in. I will be getting a 4.5 in outer barrel extension to accommodate the added length along with putting the stock flash hider back on. For the gearbox i will be replacing everything to pull the m150 spring i want. Is there anything else i should know or do before going through with this?