Help/Support Needing assistance with defining the right codes for Inf Ammo

[QuistisQueen 2.9k iPhone X 16.7.12]

So when I set the watch for inf ammo, I landed on this code (10002928C):

__text:0000000100029280                 LDR             X8, [X19,#0x470]
__text:0000000100029284                 ADD             X9, X8, X22,LSL#2
__text:0000000100029288                 STR             W20, [X9,#0xD8]
__text:000000010002928C                 LSL             X21, X22, #3
__text:0000000100029290                 ADD             X8, X8, X21
__text:0000000100029294                 LDR             X0, [X8,#0x90]
__text:0000000100029298                 SXTW            X8, W20
__text:000000010002929C                 MOV             W9, #0x66660000
__text:00000001000292A0                 MOVK            W9, #0x6667
__text:00000001000292A4                 MADD            X8, X8, X9, XZR
__text:00000001000292A8                 LSR             X9, X8, #0x3F
__text:00000001000292AC                 ASR             X8, X8, #0x22
__text:00000001000292B0                 ADD             W8, W8, W9
__text:00000001000292B4                 MOV             W9, #0xA
__text:00000001000292B8                 MSUB            W8, W8, W9, W20
__text:00000001000292BC                 STR             W8, [X0,#0x148]
__text:00000001000292C0                 STR             WZR, [X0,#0x144]
__text:00000001000292C4                 LDR             X8, [X0]
__text:00000001000292C8                 LDR             X8, [X8,#0x18]
__text:00000001000292CC                 LDR             S0, [X0,#0x174]
__text:00000001000292D0                 LDR             S1, [X0,#0x178]
__text:00000001000292D4                 BLR             X8
__text:00000001000292D8                 LDR             X8, [X19,#0x470]
__text:00000001000292DC                 ADD             X8, X8, X21
__text:00000001000292E0                 LDR             X8, [X8,#0x90]
__text:00000001000292E4                 STRB            WZR, [X8,#0x14C]
__text:00000001000292E8
__text:00000001000292E8 loc_1000292E8                           ; CODE XREF: sub_1000291D4+20↑j
__text:00000001000292E8                 SUB             SP, X29, #0x20
__text:00000001000292EC                 LDP             X29, X30, [SP,#0x20+var_s0]
__text:00000001000292F0                 LDP             X20, X19, [SP,#0x20+var_10]
__text:00000001000292F4                 LDP             X22, X21, [SP+0x20+var_20],#0x30
__text:00000001000292F8                 RET
__text:00000001000292F8 ; End of function sub_1000291D4

 

When I tried to nop all of the SUB; it may look like it worked as the number stuck on 0, but the gun is usable. The actual ammo is still subtracting from the backend which when it runs out; the weapon grayed-out. ARM64 is a little different from ARM so if I can get a little explanation and work the magic on this would be much appreciated. 

[KillerAE 188 Donor]

Which game is this?