Poly Technologies AK47 Rear Sight Housing Retaining Pin Chinese AK Rifle Black. After installing the AK47 barrel on your rifle the sight housing is slipped over the barrel from the muzzle end and aligned with the housing barrel notch. The retaining pin is then installed with a punch to secure the housing in position. Specifications for Poly Technologies AK47 Rear Sight Housing Retaining Pin Chinese AK Rifle: Manufacturer: Poly Technologies Color: Black Gun Make: Kalashnikov Gun Model: AK-47 Condition Quality: Excellent Condition Details: Other Gun Type: Rifle Package Contents: Poly Technologies AK47 Rear Sight Housing Retaining Pin Chinese AK Rifle What firearm models does the manufacturer say Poly Technologies AK47 Rear Sight Housing Retaining Pin Chinese AK Rifle is compatible with? The manufacturer suggests that Poly Technologies AK47 Rear Sight Housing Retaining Pin Chinese AK Rifle is compatible with AK-47Poly Technologies 700134: AK47 Rear Sight Housing Retaining Pin Chinese AK Rifle Black