The FAL Files  

Go Back   The FAL Files > General Information > Reference and Data Section: a FAL FAQs and Library

Notices

Reply
 
Thread Tools Display Modes
Old September 03, 2008, 16:25   #1
W.E.G.
FAL Files Administrator
Silver Contributor
 
W.E.G.'s Avatar
 
FALaholic #: 1211
Join Date: Oct 2000
Location: Virginia
Posts: 39,233
interchangeable parts - inch versus metric

interchangeable parts - inch versus metric

muzzle device
NO - threads are same pitch but turn opposite ways

barrel
YES - although inch requires a breeching washer

gas block
YES - although metric port meets barrel perpendicular, whereas inch meets at angle, also inch block is taller

gas knob
NO

gas knob retaining clip/spring
NO

gas plug
NO

gas piston
YES

gas piston spring
YES

gas tube retaining collar (the part that screws into the receiver)
YES (small issue here - but generally the answer is yes)

front sight
NO

front sight plate
(metric only)

front sight plate spring
(metric only)

front sight retaining scrw
(inch only)

handguards
YES

handguard screw
SOMETIMES - depending on source and length

handguard ring
YES

front swivel
YES

upper receiver
YES - (more or less), depending on what you hang on it

lower receiver
YES, if simply installing a complete lower from one type onto another

ejector block
YES

ejector
YES

bolt
YES

extractor
NO unless it is already installed on a bolt

extractor plunger
???

extractor spring
??? I think so

bolt carrier
YES

firing pin
generally NO -- except the discussions of one-piece and two piece firing pins, and the differing lengths and configurations, give me a brain cramp
Most metric is one-piece, and most inch is two-piece. So that settles the issue for general comparisons

firing pin spring
??? - don't think so - although it may be if a two-piece firing pin is used in a metric rifle.

firing pin retaining pin
YES

rat tail
YES

rat tail spring
YES

rat tail rivet
YES

bolt hold-open
metric fits inch but not vice-versa (inch is fatter)

bolt hold open retaining screw
YES

magazine catch
YES, but be careful of spring length (inch is longer)

magazine catch spring
NO - unless you switch the magazine catch at the same time - inch is longer

rear sight
YES - but heights differ (inch is taller)

rear sight screws
YES

top cover
metric will work on inch - but not vice-versa without bubbafication

trigger axis-pin
??? I think so

hammer axis-pin
??? I think so

hammer
NO

trigger
NO

sear
NO

hammer spring
NO

hammer plunger
NO

trigger plunger
NO

sear plunger
NO (inch doesn't even have a sear plunger)

sear spring
NO

trigger return spring
NO

hammer spring
NO (inch plunger and spring are hermetically-sealed assembly)

hammer spring shroud
NO

locking plate
NO (inch plate is unitized with lower)

selector
metric fits inch, but inch won't fit metric without modification

recoil springs
YES (both)

recoil spring plunger
YES

recoil spring tube
YES

recoil spring retaining nut
YES

locking shoulder
YES

locking body
YES

locking body plunger
??? I think so

locking lever
yes

locking body spring
yes

locking lever retaining screw
??? I think so

buttstock
NO

buttplate
NO

buttplate retaining screw
sometimes sorta (depends on configuration and length)

rear swivel
NO

pistol grip
NO

pistol grip retaining nut
NO (inch has a screw)

pistol grip retaining scrw
NO (metric has a nut)

trigger return plunger retaining plate
(inch only)

pistol grip "popsicle stick"
(inch only)

trigger guard
NO

magazine
metric usually fits inch, but not vice versa without modification

magazine followers
disagreement over this issue - most say NO

magazine springs
disagreement over this issue - most say NO

magazine floorplate
NO
__________________
.
.
.

Ask me about the Mason-Dixon FAL Collectors Association.
W.E.G. is offline   Reply With Quote
Old September 03, 2008, 16:25   #2
W.E.G.
FAL Files Administrator
Silver Contributor
 
W.E.G.'s Avatar
 
FALaholic #: 1211
Join Date: Oct 2000
Location: Virginia
Posts: 39,233
I'm sure I forgot something, and there are a couple gaps in my certainty - indicated by ???

comment as you spot issues
__________________
.
.
.

Ask me about the Mason-Dixon FAL Collectors Association.
W.E.G. is offline   Reply With Quote
Old September 05, 2008, 11:27   #3
elbo
Registered
 
elbo's Avatar
 
FALaholic #: 8362
Join Date: Dec 2002
Location: va
Posts: 2,790
???
The rear part of metric and inch two piece firing pins are identical, the front pieces are not. Metric bolt=metric firing pin, inch=inch.

Israeli Selector is another species.

Hammer shroud, spring, and plunger can be used in either lower if replaced as a set. Metric will self disassemble if your inch lower is uncocked when open.

Charging handles, metric in inch needs a spot drilled for the detent. Inch in metric needs to be thinned and receiver or handle modified so it will fold and lock.
__________________
Keep your trust in God; Your government has failed you miserably.
The Lord Gives Me Grace and the Devil Gives Me Style
elbo is offline   Reply With Quote
Old June 06, 2009, 21:38   #4
Granite3
Registered
 
FALaholic #: 45815
Join Date: May 2009
Location: Atlanta
Posts: 2
What about carry handles?

Most seem to mention heavy barrel vs standard, and not sure how to identify the HB vs standard.
Granite3 is offline   Reply With Quote
Old March 25, 2010, 20:19   #5
Newb
Registered
 
FALaholic #: 38715
Join Date: Oct 2008
Location: Oklahoma
Posts: 15
So from what I read here, a new pair of metric handguards from DSA will fit my L1A1?
__________________
"A young man who is not a liberal has no heart, an old man who is not a conservative has no brain" -Winston Churchill
Newb is offline   Reply With Quote
Old March 21, 2014, 14:58   #6
W.E.G.
FAL Files Administrator
Silver Contributor
 
W.E.G.'s Avatar
 
FALaholic #: 1211
Join Date: Oct 2000
Location: Virginia
Posts: 39,233
bump
__________________
.
.
.

Ask me about the Mason-Dixon FAL Collectors Association.
W.E.G. is offline   Reply With Quote
Old April 07, 2016, 19:47   #7
Pluribus
Average White Devil
Bronze Contributor
 
Pluribus's Avatar
 
FALaholic #: 5600
Join Date: Feb 2002
Location: Wichita, America
Posts: 5,858
Bump
__________________
I just need a million bucks! Is that so hard to understand?

Were it not for ignorance, thus we would remain.

Never hate your enemy, it only clouds your judgment.
Pluribus is offline   Reply With Quote
Old December 21, 2016, 09:33   #8
gunplumber
Arrogant Bastard
Gold Contributor
 
gunplumber's Avatar
 
FALaholic #: 96
Join Date: Jul 2000
Location: Surprise, AZ
Posts: 23,254
So why did you delete all my corrections?
__________________
T. Mark Graham, Master Gunsmith
Arizona Response Systems, LLC
gunplumber is offline   Reply With Quote
Old February 14, 2017, 19:02   #9
marktc223
Registered
Bronze Contributor
 
marktc223's Avatar
 
FALaholic #: 77992
Join Date: Jun 2016
Location: USA, Florida, Largo
Posts: 65
Bipod Interchangeablility

Are there bipods from other versions of the FAL firearm platform that won't fit on certain different manufacturers of bipod barrels? Example: Belgian to Imbel, SA to Belgian, etc.
Attention Moderator. Do you want to start another "Sticky" on this subject?
__________________
01FFL/Gunsmith 45+ years
My motto: "Quality is the Best Policy"

Last edited by marktc223; February 14, 2017 at 19:50.
marktc223 is offline   Reply With Quote
Old February 14, 2017, 19:17   #10
W.E.G.
FAL Files Administrator
Silver Contributor
 
W.E.G.'s Avatar
 
FALaholic #: 1211
Join Date: Oct 2000
Location: Virginia
Posts: 39,233
Quote:
Originally Posted by gunplumber View Post
So why did you delete all my corrections?
No idea what you are talking about Mark.
Nothing of yours has been deleted in this thread.
__________________
.
.
.

Ask me about the Mason-Dixon FAL Collectors Association.
W.E.G. is offline   Reply With Quote
Old February 14, 2017, 19:17   #11
W.E.G.
FAL Files Administrator
Silver Contributor
 
W.E.G.'s Avatar
 
FALaholic #: 1211
Join Date: Oct 2000
Location: Virginia
Posts: 39,233
Quote:
Originally Posted by marktc223 View Post
What about the interchangeability of bipods between different versions of the FAL that have bipod barrels?
Attention Moderator. Do we need to start another "Sticky" on this subject?
Glad you brought that up.

Thank you for volunteering to write it.
__________________
.
.
.

Ask me about the Mason-Dixon FAL Collectors Association.
W.E.G. is offline   Reply With Quote
Old February 15, 2017, 08:14   #12
gunplumber
Arrogant Bastard
Gold Contributor
 
gunplumber's Avatar
 
FALaholic #: 96
Join Date: Jul 2000
Location: Surprise, AZ
Posts: 23,254
Corrected - again.

interchangeable parts - L1A1 versus FAL (there is no "metric" and "inch")

major groups - yes.
Complete barreled upper, complete bolt & carrier assembly, complete lower assembly will interchange with the limiting factor being rear sight must match front sight for height. Parts within the assemblies, no.

muzzle device NO, except early RH thread FALs
FAL 9/16x24, LH
L1A1 9/16x24 RH

receiver - yes
except for some differences which can be worked around easily, and which magazine, FAL & L1A1 can be built on either receiver.
differences = ejector block dimensions (mag catch and bolt hold open fit), cocking handle clearance, receiver cover clearance

barrel & gas block no
FAL = 90 degree gas port
L1A1 = 45 degree gas port
some have morphed the two together with various degrees of success. L1A1 uses a breeching washer. Much match rear sight to front sight.

gas regulator -NO
FAL screwed on
L1A1 retained by spring clip

gas regulator adjustment spring - YES

gas plug - NO

gas piston - YES

gas piston spring YES

gas tube support nut - no (the part that screws into the receiver)
L1A1 has clearance for breeching washer and can be used on FAL
FAL has no breeching washer clearance and cannot be used on L1A1.

front sight - NO

front sight plate -NO
(FAL only)

front sight plate spring - NO
(FAL only)

front sight retaining screw - no
(FAL only)

handguards - yes

handguard screw - no
FAL & L1A1 are both #10x32 thread, but the FAL is a larger shaft. Hole in gas block muyst be enlarged.

handguard ring - no
FAL - no clearance for breeching washer

front swivel - sometimes
FAL - parallel sides
L1A1 UK "wings" limit travel
L1A1 Australia - tab on sling band must fit into clearance cut not present on FAL barrels.

ejector block - no
channel for bolt hold open smaller on L1A1.
hole for mag catch spring larger on L1A1

ejector - no
L1A1 ejector block includes fixed ejector
FAL may be fixed or (more common) removeable

complete bolt assembly - yes
firing pin retaining pin, yes.
extractor, spring, plunger -no
firing pin, sprin - no

bolt carrier, bolt carrier rat tail, spring, plunger, axle/rivet - YES

bolt hold-open - no
FAL larger diameter

magazine catch & Spring - no
ejector block spring hole may be enlarged to use larger L1A1 spring on FAL
magazine catch screw - no
ambidextrous feature of l1a1 mag catch requires large head L1A1 screw. May interchange as a catch, spring, screw assembly with appropriate sized spring recess in e4-block

rear sight assemblies - YES
components within the rear sight - no
rear sight screws - yes
rear sight windage spring - yes

receiver cover
L1A1 has tabs FAL does not. FAL will fit L1A1, tabs must be removed on an L1A1 to fit FAL

trigger axis-pin - no
L1A1 smaller
hammer axis-pin - no
L1A1 larger

hammer, trigger, sear -no

hammer strut assembly - yes
parts within hammer strut assembly - no

trigger plunger, sear plunger, trigger spring, sear spring - NO

selector - no
FAL has a limit pin for selector travel
L1A1 has a tab that hits upper receiver to limit travel
either can be modified to work with the other, as axel dimensions are the same

return spring, inner & outer, return spring plunger - yes

recoil spring tube - no
L1A1 larger thread

recoil spring retaining nut
YES, except for early ones for the wood stock L1A1 are not threaded inside for the buttplate screw.

locking shoulder - YES

locking body - YES
L1A1 has flat nose, but they interchange.

locking body plunger - no
fal is round for wasp-waist pin
L1A1 is flat for straight retaining pin.

locking lever - yes

locking body spring - yes

locking lever retaining screw - yes

buttstock, buttplate - no

buttplate retaining screw - yes
all are 1/4x28 - L1A1 comes in 4 different lengths.

rear swivel -NO

pistol grip & grip hardware - NO

trigger guard - NO

magazine - no
FAL will fit L1A1, but with no front support, the front of the mag will droop and cause intermittant feeding malfunctions.

magazine, & magazine components - no
L1A1 spring and follower have different method of retention than FAL. Spring can be used but suboptimal
__________________
T. Mark Graham, Master Gunsmith
Arizona Response Systems, LLC
gunplumber is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -5. The time now is 10:22.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
©1998-2015 The FAL Files