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Receiver Thickness

AK-Builder Flat

Our receiver flats have been the standard go-to flats for years.  All flats are made with 4130 steel for the best results for heat treating.

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AK-Builder AK47 7.62 receiver flat, 4130 annealed, in the white, with pre-punched trunnion holes.
AK47 7.62 Flat With Trunnion Holes
0.0
In Stock
$4695
+ −
The front and rear trunnion holes on these flats are pre-punched to help with the installation of the trunnions.  In some cases the front trunnion rivet holes may not line up do to how the factories drilled the holes in the trunnions.   Receiver flat thickness= 1mm...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
Y & I Optional Embossing
Standard AK47 Fixed Stock 7.62 Flat
0.0
In Stock
$4495
+ −
Now with Y & I embossing! These flats can be used for about any 1mm thick 7.62 receiver.  Without the trunnion holes you can put any rear trunnion on the receiver once bent. Receiver flat thickness= 1mm (.040") Material 4130 Annealed Comes with...
Flat optionsWith Y & I Embossing Receiver Thickness1mm
Side view of 1.5mm heat treated 4130 steel center support and rivet, in the white.
1.5mm Center Support and Rivet
0.0
In Stock
$700
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These are made from heat treated 4130 steel and the rivets are a copy of an original AK center support rivet. The length is shorter than the 1mm center supports since the inside of the 1.5mm flats is smaller
AK-Builder AK74 5.45x39 receiver flat, 4130 annealed, in the white, with 5.45 magwell dimples.
AK74 5.45x39 Fixed Stock Receiver Flat
0.0
In Stock
$4595
+ −
This flat has the magwell and mag dimples to match the 5.45 magazines which are narrower then 7.62 mags.  There are no front or rear trunnion holes.   Receiver flat thickness= 1mm (.040")   Material 4130 Annealed Comes with bolt guide rails...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
New Sidefolder Reinforcement Plate
Triangle Sidefolder Reinforcement Plate
0.0
In Stock
$1495
+ −
These new plates have been made from the dimensions of original demilled Russian and Bulgarian plates. This plate welds to the rear lower section of the receiver to strengthen that area when using folding stocks.  The bend is in the right spot and not touching the hole so there are...
Angled view of Polish Underfolder 4130 steel flat in the white with bolt guide rails.
Polish Underfolder Flat
0.0
In Stock
$5995
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The Polish Underfolder is the most popular underfolder parts kit and this was the first specialty flat that I had perfected by modifying existing flats in 2004.  Now they are stamped out specifically for the Polish Underfolder from raw steel. Receiver flat thickness= 1mm (.040")...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
Top view of unbent Hungarian AMD 65 receiver flat, 1mm 4130 steel, in the white.
Hungarian AMD 65 Receiver Flat
0.0
In Stock
$5995
+ −
These are the correct flats for the AMD-65 parts kits with the sidefolding stock.  These do not need the sidefolder reinforcement plate.  The holes on the bottom of the receiver for the push button and the stock pivot pin are undersized and will need to be opened up after bending.Use...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
UNDERFOLDER REINFORCEMENT PLATE, A2-41
Underfolder Reinforcement Plate
0.0
In Stock
$1495
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This is a new design that matches the original plates.  Orders shipped after 9/5/2015 will have the newer design. These are not needed on the Yugo's unless you aren't using the original pistol grip mounting plate. This plate welds to the rear lower section of the receiver to strengthen...
Romanian MD63/M65 underfolder receiver flat with bolt guide rails, annealed 4130 steel, pre-drilled holes.
Romanian MD63/M65 Underfolder Flat
0.0
In Stock
$5995
+ −
    These are made to work with the Romanian underfolder stocks and will not work with the Polish or Yugo sets.  There is no need to buy a reinforcement plate for this receiver. Trunnion not included. Receiver flat thickness= 1mm (.040")   Material...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
AK-Builder Bulgarian Sidefolder AK74SU 5.45 flat, unfinished 4130 steel with guide rails.
Bulgarian Sidefolder AK74SU 5.45 Flat
0.0
In Stock
$4995
+ −
This flat was made for the Bulgarian style sidefolding triangle or polymer stock.  The magwell and magwell dimples are made to fit 5.45 magazines.  If you are going to use a 7.62 front end then look up my Khyber Pass receiver flat .   Receiver flat thickness=...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
M92 UNDERFOLDER TRUNNION FLAT, B1-31Y
M92 Underfolder Trunnion Flat
0.0
In Stock
$5995
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This flat will work with the M92 or M70 that has the flat sided front trunnion . These will NOT WORK with the bulged RPK style trunnions.   There aren't many that have the flat sided front trunnion, but there are a few out there.   Receiver flat thickness= 1mm...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
HUNGARIAN AMMS AK63 UNDERFOLDER FLAT, B1-51Y
Hungarian AMMS AK63 Underfolder Flat
0.0
In Stock
$5995
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THESE DO NOT HAVE ALIGNMENT HOLES IN THEM ANYMORE The AMMS trunnions I have seen are machined unlike the Polish which are stamped and welded together.  This flat will not work with the Yugo M70, Yugo M92, Polish Underfolder or Romanian Underfolder rear trunnion....
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
7.62 SIDEFOLDER KHYBER PASS FLAT - TOP RAIL BENT AND TRIMMED, B2-31Y
7.62 Sidefolder Khyber Pass Flat - Top Rail Bent and Trimmed
0.0
In Stock
$5995
+ −
T h is flat is for using a Bulgarian style rear sidefolding stock/trunnion to make the so called "Khyber Pass" AK's in 7.62x39. Receiver flat thickness= 1mm (.040")   Material 4130 Annealed Comes with bolt guide rails Rails and flat need to be...
OptionsWith Y & I Embossing Receiver Thickness1mm
Polish Tantal 5.45x39 4130 annealed receiver flat with unique selector holes and bolt guide rails.
Polish Tantal Flat 5.45 x 39
0.0
In Stock
$5995
+ −
This flat is specifially made for the Polish Tantal to work with the left side selector and right side safety.  The hole for the selector/safety is a different shape and in a differen location than a standard AK receiver.  If you want to use a standard 5.45 receiver with the Tantal...
Premium Flat OptionsWith Y & I Embossing Receiver Thickness1mm
AK-Builder Yugo M72 RPK 1.5mm receiver flat, annealed 4130 Chromoly steel with rails.
Yugo M72 1.5mm RPK Receiver Flat
0.0
In Stock
$5750
+ −
Finally there is an alternative to the home builder to make your own professional grade 1.5mm receiver from a flat. The material these are made from is .063 4130 Chromoly steel that is in the annealed condition. Yes annealed means it needs to be heat treated. Yes the flats come with rails as...
Receiver Thickness1.5mm
Romanian 7.62 RPK 1.5mm receiver flat and matching bolt guide rails, 4130 steel in the white.
Romanian 7.62 RPK Receiver Flat 1.5mm
0.0
Out-of-stock
$5850
These flats are for the bulged trunnion RPK 47 7.62 parts kits.  The flats and rails are made from 4130 and are in the soft annealed condition and need to be heat treated after bending. The RPK flats don't have magwell dimples, but have different bolt guide rails that make up for it....
Receiver Thickness1.5mm
YUGO M70 1.5MM YUGO FIXED STOCK FLAT, B3-11
Yugo M70 1.5mm Yugo Fixed Stock Flat
0.0
In Stock
$5750
+ −
Finally there is an alternative to the home builder to make your own professional grade 1.5mm receiver from a flat.  The material these are made from is .063 4130 Chromoly steel that is in the annealed condition.  Yes annealed means it needs to be heat treated.  Yes the flats...
Receiver Thickness1.5mm
Angled view of AK-Builder Yugo M70 1.5mm underfolder flat, 4130 Chromoly in the white.
Yugo M70 1.5mm Yugo Underfolder Flat
0.0
In Stock
$5750
+ −
Finally there is an alternative to the home builder to make your own professional grade 1.5mm receiver from a flat. The material these are made from is .063 4130 Chromoly steel that is in the annealed condition. Yes annealed means it needs to be heat treated. Yes the flats come with rails as...
Receiver Thickness1.5mm
SAIGA 12 RUSSIAN EXTENDED REINFORCEMENT PLATE, A2-43
Save 18%
Saiga 12 Russian Extended Reinforcement Plate
0.0
In Stock
$1795 $2195 -18%
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This is for the longer Russian pistol grip to fit on the Saiga 12.  The Hogue pistol grip is longer than standard and uses this same plate. Pistol grip and nut not included. 2.5" long.  
Angled view of AK-Builder 1.5mm 4130 steel Yugo M85/M95 underfolder flat, in the white.
Yugo M85/M95 1.5mm Yugo Underfolder Flat
0.0
In Stock
$5750
+ −
This is the 1.5mm 4130 flat and rails for the M85 kits that are out.  It's basically just our standard M70 underfolder flat without the pin holes cut for the recoil assembly locking pin.  The center support will have to be clearanced to fit the .223 magazines. The magwell size is...
Receiver Thickness1.5mm
AK-Builder Yugo lower bolt guide rails with mag stabilizers, 4130 annealed steel, in the white.
AK-Builder Lower Bolt Guide Yugo Rails
0.0
In Stock
$1095
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Get a set of the best US made rails available! These have mag stabilizers on both rails unlike any other rails made in the US.There are no holes drilled in these and should be drilled after being welded into your receiver. These are made from 4130 annealed steel which means "not heat treated"....
Chinese MAK 90 With Mag well dimples
Chinese MAK90 With Magwell dimples
0.0
In Stock
$5495
+ −
This is our MAK90 flat with top rails machined and mag well dimples. These come with lower bolt guide rails. Due to the dimensional differences between these and the other flats you will need to use our Mak90 punch for the bending die.  Originally the receivers were made from .057"...
Receiver Thickness1.27mm
MAK 90 UNDERFOLDER FLAT WITH MAGWELL DIMPLES, B1-41
Mak 90 Underfolder Flat With Magwell Dimples
0.0
In Stock
$5895
+ −
THIS REQUIRES OUR MODIFIED MAK90 PUNCH TO BEND CORRECTLY. IF YOU USE OUR OLD PUNCH IT WILL RUIN THE FLAT! WE HAD TO MODIFY THE MAK90 PUNCH TO ACCOMADATE THE UNDEDRFOLDER STAMPING ON THESE FLATS. THE NEW PUNCH WE OFFER CAN BE USED ON ALL MAK90 FLATS THAT WE SELL.   How to...
Angled view of AK-Builder M70/M72 Yugo 1.5mm NO-HOLES receiver flat, annealed 4130 steel with integral rails.
M70/M72 Yugo 1.5mm NO-HOLES Flat
0.0
In Stock
$5750
+ −
Finally there is an alternative to the home builder to make your own professional grade 1.5mm receiver from a flat. The material these are made from is .063 4130 Chromoly steel that is in the annealed condition. Yes annealed means it needs to be heat treated. Yes the flats come with rails as...
Receiver Thickness1.5mm
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