[Hawk552]

I can imagine a better solution to this is as follows:

/* AMXx No Recoil (Universal)
*   This is a No recoil plugin, based heavily on Knekter's Adv No recoil, but it contains no CS functionalilty.
*/

#include <amxmodx>
#include <fakemeta>

#if !defined IVecFVec
    #define IVecFVec fm_IVecFVec
#endif

// Engine's button define :O
#define IN_ATTACK (1<<0)

new szPlugin[] = "AMXx No Recoil (Universal)",
szVersion[] = "0.1.0",
szAuthor[] = "Charr";

new Float:VecSet[33][3],
gAttack[33];

new gRecoilFlag = ADMIN_IMMUNITY,
gNoRecoil;

public plugin_init()
{
    register_plugin(szPlugin,szVersion,szAuthor);

    register_concmd("amx_norecoil","admin_norecoil",ADMIN_IMMUNITY,": < 0 (DISABLED) | 1 (ENABLED) | 2 (ADMIN ONLY) >");
    register_concmd("amx_norecoil_level","admin_norecoil_level",ADMIN_IMMUNITY,": < FLAG >");

    register_forward(FM_PlayerPreThink,"FakeMeta_PreThink");
    register_forward(FM_TraceLine,"FakeMeta_PostTraceLine",1);
}

// Command to enable/disable no recoil
public admin_norecoil(id,level)
{
    if(get_user_flags(id) & level)
    {
        new szArg[32];
        read_argv(1,szArg,31);

        new Arg = str_to_num(szArg);

        if( 0 <= Arg <= 2)
        {
            gNoRecoil = Arg;
        }

        else
        {
            console_print(id,"amx_norecoil: < 0 (DISABLED) | 1 (ENABLED) | 2 (ADMIN ONLY) >");
        }
    }

    else
    {
        console_print(id,"Unknown command: amx_norecoil");
    }

    return PLUGIN_HANDLED;
}

// Command for changing the level for admin no recoil
public admin_norecoil_level(id,level)
{
    if(get_user_flags(id) & level)
    {
        new szArg[32];
        read_argv(1,szArg,31);

        gRecoilFlag = read_flags(szArg);
    }

    else
    {
        console_print(id,"Unknown command: amx_norecoil_level");
    }

    return PLUGIN_HANDLED;
}

// Calculating the player's view based on when they hit the attack button
public FakeMeta_PreThink(id)
{
    if(gNoRecoil)
    {
        new buttons = pev(id,pev_button);
    
        if(!gAttack[id] && buttons & IN_ATTACK)
        {
            gAttack[id] = 1;
    
            set_pev(id,pev_punchangle,{0.0 , 0.0 , 0.0});
    
            new Origin[3];
            
            get_user_origin(id,Origin,3);
            IVecFVec(Origin,VecSet[id]);
        }
    
        if(gAttack[id] && buttons & ~IN_ATTACK)
        {
            gAttack[id] = 0;
        }
    }
}

// Setting the player's view
public FakeMeta_PostTraceLine(Float:Vec1[3],Float:Vec2[3],noMonsters,id)
{
    switch(gNoRecoil)
    {
        case 1: set_tr(TR_vecEndPos,VecSet[id]);
        case 2: if(get_user_flags(id) & gRecoilFlag) { set_tr(TR_vecEndPos,VecSet[id]); }
    }
}

// Clears the Global vars so that other players that join do not experiance problems
public client_connect(id)
{
    for(new i = 0; i < 3; i++)
    {
        VecSet[id][i] = 0.0;
    }

    gAttack[id] = 0;
}

// VEN's FVecIVec directly from FM Util
stock fm_FVecIVec(const Float:FVec[3], IVec[3])
{
    IVec[0] = floatround(FVec[0])
    IVec[1] = floatround(FVec[1])
    IVec[2] = floatround(FVec[2])

    return 1
}

But 2 things:
1) VEN did not write this, I would not give him credit if I were you
2) It should function even if you include engine, and if you do it will use the engine function instead.