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Old September 03, 2008, 16:25   #1
W.E.G.
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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
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Old September 03, 2008, 16:25   #2
W.E.G.
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I'm sure I forgot something, and there are a couple gaps in my certainty - indicated by ???

comment as you spot issues
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Old September 05, 2008, 11:27   #3
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???
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.
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Old June 06, 2009, 21:38   #4
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What about carry handles?

Most seem to mention heavy barrel vs standard, and not sure how to identify the HB vs standard.
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Old March 25, 2010, 20:19   #5
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So from what I read here, a new pair of metric handguards from DSA will fit my L1A1?
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Old March 21, 2014, 14:58   #6
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bump
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Old April 07, 2016, 19:47   #7
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Bump
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Old December 21, 2016, 09:33   #8
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So why did you delete all my corrections?
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Old February 14, 2017, 19:02   #9
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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?
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Old February 14, 2017, 19:17   #10
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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.
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Old February 14, 2017, 19:17   #11
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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.
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Old February 15, 2017, 08:14   #12
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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 - sort-of.
FAL axle is larger diameter than L1A1 but only a hair. Can be sanded or hole reamed.

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
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Last edited by gunplumber; July 23, 2019 at 09:11.
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Old August 31, 2018, 06:46   #13
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On the advice I've reopened this thread about inch/metric differences....my head HURTS! I think I'll just buy a "made" riFal! Thx for ALL the info-pretty good!
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Old December 29, 2018, 17:33   #14
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This seems to be the most appropriate thread to post this in

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Old April 20, 2019, 15:27   #15
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Handguards Screw, FAL (metric), wood and plastic are the same?
Thanks
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Old April 20, 2019, 15:39   #16
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Quote:
Originally Posted by gijoeflint View Post
Handguards Screw, FAL (metric), wood and plastic are the same?
Thanks
No. Wood is longer. and not captive to the plastic or metal handguard.

Same #10-32 thread.
Depending on R side HG recess you can use an L1A1if you reduce the shaft a few thous in a hand drill

If a US handguard, it might be #10-24
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Old April 20, 2019, 15:57   #17
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I have a set of Belgian wood HG, but no screw.
want to know if can use one from a broken plastic set or place
a WTB in the Market place asking for WOOD HG.
I can try with a extra L1A1 first.
thanks Mark.
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Old April 25, 2019, 23:38   #18
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Inch Buttplate lower machine screw

Guess what I found a great application for the L1A1 Buttplate Screw? Aside from securing the rear sling swivel in place.

I found that it works perfectly with a set of Iron Wood metric G1 handguards. I realize Iron Wood did not make these 100 percent exact to the original Belgian standard - but for what it is worth, I found the L1A1 Lower buttplate screw was spot on in terms of thread pitch, screw head size and diameter, and overall length of screw - I mean flush.


Rav of Dealer Warehouse sold me the NOS screws for $5.00. Since I had a couple laying around, I began to experiment after God knows how many attempts to finding out original metric screws were too short, etc. One L1A1 inch screw diameter was a tad too large to pass through the metric gas block - probably would have worked if I polished a surface or two, but another NOS inch screw passed through the metric GB with no effort at all. Looks factory original.

Last edited by Chester Nimitz; April 25, 2019 at 23:44.
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Old May 21, 2019, 16:36   #19
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Are the metric and inch gas block retaining pins interchangeable?

How about the frame lock pin?

Gas tube pin?

Rear site retaining screws?
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Old May 21, 2019, 17:04   #20
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Quote:
Originally Posted by johnnycobra View Post
Are the metric and inch gas block retaining pins interchangeable?
No. L1A1 is tapered #0, FAL is 5/32. But you can drill out the L1A1 taper to a #23 or #24 and use FAL

Quote:
How about the frame lock pin?
No. The FAL is wasp-waist for a rounded plunger. The L1A1 is solid with flared ends for a flat plunger.

Quote:
Gas tube pin?
yes

Quote:
Rear site retaining screws?
Yes, although L1A1 are finer adjustment.
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Old June 08, 2019, 13:59   #21
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Should we add the Indian and Israeli versions here for good measure?
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