Invisible model when zoomed in (SFM)

[deceptor666]

So I used an Insurgency attachment pack from gmod workshop for SFM use, but problem is that some of the models became invisible while zoomed in (and visible while zoomed out).

[IMG]http://orig02.deviantart.net/6979/f/2016/291/e/5/zoomed_in_by_brsfanmxy-dalhmhp.png[/IMG] [IMG]http://orig11.deviantart.net/5dc3/f/2016/291/a/9/zoomed_out_by_brsfanmxy-dalhmik.png[/IMG]

I've decompiled the model and check it's .qc with lines below, but no idea how to fix it:

$ModelName "weapons\upgrades\a_standard_galil.mdl"
$BodyGroup "attachment"
{
studio "a_standard_galil_reference.smd"
}
$SurfaceProp "default"
$Contents "solid"
$MaxEyeDeflection 90
$CDMaterials "models\weapons\galil\"
$CBox 0 0 0 0 0 0
$BBox 19.985 -2.541 -3.281 22.336 -1.91 -1.403
$Sequence "idle" {
"a_standard_galil_anims\idle.smd"
activity "ACT_VM_IDLE" 1
fadein 0.2
fadeout 0.2
fps 30
loop
}

I also checked the model using blender (first time using this) and it appeared like this:
[IMG]http://img04.deviantart.net/a427/i/2016/291/7/e/blenderbug_by_brsfanmxy-dalho4f.jpg[/IMG]

Any help is appreciated. Also I hope the fix become viable/useful for every model that has a same problem.