Hi I'm looking for some help on fixing my items defaulting shading, as by default it isn't a smooth shading. 
Here is what I mean

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Here is what I'm trying to do (this was taking using a shader)
 

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My models MTL: 
 

newmtl TEX_w2dkn07
map_Kd rcraft:items/w2dkn07

Here is its Blockstate file:
 

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{
    "forge_marker": 1,
    "variants": {
    "type": {
		"1": {
			"model": "rcraft:tribalgrappler/tribalgrappler07l.obj"
		}
    }
	},
	"defaults" : {
	
	"transform": {
	
	"thirdperson_righthand": {
	"rotation": [ 0, 180, 0 ],
	"translation": [ -1.215, 1.02, -0.90 ],
	"scale": [ 2.30, 2.30, 2.30 ]
	},
	"thirdperson_lefthand": {
		"rotation": [ 0, 180, 180 ],
		"translation": [ -1.23, -1.27, -0.90 ],
		"scale": [ 2.30, 2.30, 2.30 ]
	},
	"firstperson_righthand": {
		"rotation": [ 0, 190, 0 ],
		"translation": [ -0.70, 0.30, -0.50 ],
		"scale": [ 1.00, 1.00, 1.00 ]
	},
	"firstperson_lefthand": {
		"rotation": [ 0, 0, 0 ],
		"translation": [ 0.00, 0.00, 0.00 ],
		"scale": [ 1.00, 1.00, 1.00 ]
	},
	"gui": {
		"rotation": [ 96, 50, 216 ],
		"translation": [ 0.50, -0.60, 0.00 ],
		"scale": [ 1.90, 1.90, 1.90 ]
	},
	"head": {
		"rotation": [ 0, 0, 0 ],
		"translation": [ 0.00, 0.00, 0.00 ],
		"scale": [ 1.00, 1.00, 1.00 ]
	},
	"fixed": {
		"rotation": [ 0, 0, 0 ],
		"translation": [ 0.00, 0.00, 0.00 ],
		"scale": [ 1.00, 1.00, 1.00 ]
	},
	"ground": {
		"rotation": [ 0, 0, 0 ],
		"translation": [ 0.60, 0.20, 0.60 ],
		"scale": [ 1.00, 1.00, 1.00 ]
	}
	}
	}
}

 

 

If you need anything else, please let me know!

Looks like your face normals are reversed for some faces. You will need to find those faces in your modeling software and reverse their normals.